{ "data": { "similar": [ { "grade": "B", "json": "https://www.anchorterminal.com/tools/mailtrap.json", "name": "Mailtrap Email API + MCP", "score": 66.8, "shared": [ "email.send", "email.inbound", "email.templates", "email.domains", "email.analytics", "email.threads" ], "slug": "mailtrap" }, { "grade": "BB", "json": "https://www.anchorterminal.com/tools/amazon-ses.json", "name": "Amazon SES", "score": 75.1, "shared": [ "email.send", "email.inbound", "email.templates", "email.domains", "email.analytics" ], "slug": "amazon-ses" }, { "grade": "BB", "json": "https://www.anchorterminal.com/tools/resend.json", "name": "Resend API + MCP", "score": 75.1, "shared": [ "email.send", "email.inbound", "email.templates", "email.domains", "email.analytics" ], "slug": "resend" }, { "grade": "BB", "json": "https://www.anchorterminal.com/tools/agentmail.json", "name": "AgentMail API + MCP", "score": 74.9, "shared": [ "email.send", "email.inbound", "email.threads", "email.domains", "email.analytics" ], "slug": "agentmail" }, { "grade": "B", "json": "https://www.anchorterminal.com/tools/postmark.json", "name": "Postmark API + MCP", "score": 66.5, "shared": [ "email.send", "email.inbound", "email.templates", "email.domains", "email.analytics" ], "slug": "postmark" }, { "grade": "B", "json": "https://www.anchorterminal.com/tools/mailgun.json", "name": "Mailgun API + MCP", "score": 66.2, "shared": [ "email.send", "email.inbound", "email.templates", "email.domains", "email.analytics" ], "slug": "mailgun" } ], "tool": { "slug": "mailersend", "name": "MailerSend", "vendor": "MailerSend, Inc.", "vendorUrl": "https://www.mailersend.com", "kind": "http-api", "category": "email", "summary": "Transactional email service from MailerSend, Inc. with a REST API, SMTP relay, templates, inbound routing, webhooks and analytics, plus SMS and WhatsApp sending. Agents reach it with a scoped API token or through a hosted MCP server.", "url": "https://www.anchorterminal.com/tools/mailersend", "markdownUrl": "https://www.anchorterminal.com/tools/mailersend.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/mailersend.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/mailersend.json", "repo": "https://github.com/mailersend/mailersend-nodejs", "license": "Proprietary service under MailerSend's terms of use. The SDKs and the CLI on GitHub are MIT", "transports": [ "http", "streamable-http" ], "remoteUrl": "https://api.mailersend.com/v1", "packages": [ { "registry": "npm", "name": "mailersend" }, { "registry": "pypi", "name": "mailersend" } ], "auth": "mixed", "authNotes": "The REST API takes a Bearer API token, created in the dashboard or through /v1/token, with any of 30 scopes and an optional sending domain. Tokens can be paused and deleted. SMTP relay uses separate SMTP users. The MCP server and the CLI use OAuth with a browser login, and the MCP authorisation server supports dynamic client registration and PKCE. Access is self-serve, but a new account passes an approval step before full sending.", "pricing": "freemium", "pricingNotes": "Free plan with 500 emails a month and 100 API requests a day, which the pricing FAQ says needs a card once the account is approved. A 14-day Professional trial starts at signup with the same limits. Hobby is $7 a month for 5,000 emails, Starter from $35 for 50,000 and Professional from $110 for 50,000, with overage of $0.50 to $1.50 per 1,000. Yearly billing takes 10 per cent off. Enterprise is priced by sales (https://www.mailersend.com/pricing, checked 2026-10-08).", "priceSummary": "$7 / mo", "where": "hosted", "x402": { "level": "no", "evidence": "No x402, MPP or L402 in the developer docs, the OpenAPI file or the pricing page (checked 2026-10-08).", "endpoints": [] }, "toolCount": 127, "popularity": { "githubStars": 175, "npmWeekly": 128453, "pypiWeekly": 15086, "asOf": "2026-10-08" }, "docsUrl": "https://developers.mailersend.com", "llmsTxt": "https://developers.mailersend.com/llms.txt", "openapi": "https://api.swaggerhub.com/apis/MailerSend/mailersend-api/1.0.0-oas3.1", "capabilities": [ "email.send", "email.inbound", "email.templates", "email.domains", "email.analytics", "email.verification", "email.threads", "messaging.sms", "messaging.whatsapp" ], "tags": [ "hosted", "freemium", "mcp", "oauth", "openapi", "llms-txt", "typescript", "python", "webhooks", "sms", "whatsapp", "status-page", "sla" ], "lastRelease": "2026-09-29", "graded": true, "anchor": { "graded": true, "score": 69.5, "grade": "B", "agentReady": false, "rank": 156, "ranked": true, "rankOf": 722, "categoryRank": 3, "methodology": "0.4", "run": "2026-10-01", "scores": { "ergonomics": 69, "maintenance": 83, "payments": 30, "reliability": 95, "schema": 73, "security": 62, "transparency": 64 }, "pending": [ "performance", "tasks" ], "breakdown": [ { "key": "reliability", "name": "Reliability", "weight": 16, "effectiveWeight": 20, "score": 95, "points": 19, "reason": "Graded on the hosted REST API. Status page at status.mailersend.com with ten components and per-component uptime (20). Every component shows 100 per cent for July to October 2026, and the incident feed has no entry after 3 December 2024, with one 30-minute database maintenance scheduled (30). Rate limits published per endpoint, 120 requests a minute on POST /v1/email, with daily quotas by plan (15). A 429 carries retry-after, x-ratelimit and x-apiquota headers, and the docs say to wait the stated seconds. No idempotency key for sends (10 of 15). A 99.5 per cent monthly uptime SLA with service credits from Starter (10). GA (10)." }, { "key": "performance", "name": "Performance", "weight": 10, "effectiveWeight": 0, "pending": true, "points": 0, "reason": "Pending. Latency is measured per call by our probes, which haven't run yet, so this run doesn't score it. Its weight is shared across the assessed categories until the first probe window closes." }, { "key": "schema", "name": "Schema \u0026 documentation", "weight": 13, "effectiveWeight": 16.25, "score": 73, "points": 11.86, "reason": "OpenAPI 3.1 on SwaggerHub with 59 paths and 97 operations, but no WhatsApp, DMARC or blocklist monitoring paths and no error responses (20 of 25). llms.txt on the docs site and every page served as Markdown at \u003cpath\u003e.md (10). The OpenAPI file has one-line summaries only, while the reference pages state limits and plan conditions per endpoint. The MCP tool definitions can't be read without an account (10 of 20). Parameter tables give type, required and limits, such as 50 To recipients and the nine template languages. The spec has 6 enums (11 of 15). Request examples in up to seven languages and 52 MS error codes with explanations (14). /v1 in the path. The changelog at /whats-new is listed in llms.txt but wasn't read, because the site answered with a bot check (8 of 15)." }, { "key": "ergonomics", "name": "Agent ergonomics", "weight": 13, "effectiveWeight": 16.25, "score": 69, "points": 11.21, "reason": "List endpoints take `page` and `limit` (10 to 100), with no field selection. The MCP server lists 127 tools with no documented toolsets (15 of 25). Pagination throughout, and date, event and domain filters on activity, messages and analytics (17). 52 documented error codes that name the fix, and field-level 422 messages (18). No idempotency key for sends. The `x-message-id` header lets a client look a send up before retrying. MCP annotations couldn't be read (5 of 20). Few required fields on a send, template defaults for sender and subject, and official SDKs in six languages (14)." }, { "key": "security", "name": "Security \u0026 auth", "weight": 14, "effectiveWeight": 17.5, "score": 62, "points": 10.85, "reason": "API tokens with any of 30 scopes, read or full by area, optionally tied to one sending domain, and pausable or deletable through the API. OAuth with PKCE and dynamic client registration on the MCP server and the CLI (30). Read scopes, token pause and IP allowlisting from Starter. No confirmation step documented for deletes or sends (13 of 20). Inbound mail and activity data carry untrusted content. The terms place responsibility for a connected agent on the customer, and no injection guidance was found in the docs (3 of 15). Email activity logs on every plan for 1 to 30 days, API request logs only on Professional (7 days) and Enterprise (14 days) (9 of 15). A responsible disclosure programme is linked from the legal index, its text unread behind a bot check. No security.txt. The security statement cites ISO 27001 for the data centre and names no SOC 2 or ISO 27001 of MailerSend's own. A guide covers leaked credentials (7 of 20)." }, { "key": "payments", "name": "Payments \u0026 pricing", "weight": 10, "effectiveWeight": 12.5, "score": 30, "points": 3.75, "reason": "No x402, MPP or L402 (0). Plan prices and overage per 1,000 emails are public for every plan, $1.50 on Hobby and $1.30 on Starter at 50,000 (20). The 14-day trial starts at signup with 500 emails, but the pricing FAQ says the Free plan asks for a card after approval. Whether the trial needs a card wasn't established, so half (10 of 20). Browser signup and an account approval step before full sending (0)." }, { "key": "tasks", "name": "Task success", "weight": 10, "effectiveWeight": 0, "pending": true, "points": 0, "reason": "Pending. Task success needs the category task suites run through each tool, which haven't run yet, so this run doesn't score it. Its weight is shared across the assessed categories until then. A data provider's data-quality score is published on its listing now and becomes half of this category when it's scored." }, { "key": "maintenance", "name": "Maintenance \u0026 community", "weight": 7, "effectiveWeight": 8.75, "score": 83, "points": 7.26, "reason": "Python SDK 2.1.1 on 29 September 2026 and Node.js SDK v3.5.0 tagged 23 September (30). In the last 90 days the Node.js SDK had five tagged releases, the Python SDK three and the CLI one (20). The SDK repositories are active with merged pull requests in late September. We couldn't read issue replies, and the product changelog was unread behind a bot check (10 of 15). Current official SDKs in six languages (15). Renovate and a test matrix on Node 20, 22 and 24 in the Node.js SDK. The Python SDK has tests but only a publish workflow, and npm's latest is 3.4.1 while the repository tags 3.5.0 (8 of 10)." }, { "key": "transparency", "name": "Transparency \u0026 trust", "weight": 7, "effectiveWeight": 8.75, "score": 64, "points": 5.6, "note": "editorial 43, provenance 84", "reason": "Closed service with published terms and MIT SDKs. The terms allow changes to the service and the terms without notice and account closure without cause (17 of 30). The privacy policy (17 September 2026) gives deletion within 30 days of a request, removal of accounts inactive for two years with three email warnings, and EU data centres. Activity retention by plan is on the pricing page. The terms grant a licence to use the inputs and outputs of AI functions to improve AI models, and the Data Processing Addendum was unread behind a bot check (18 of 30). No deprecation policy found in the docs, and the terms reserve change without notice (0). The privacy policy names OpenAI, Google Vertex AI and Google Cloud Translation and states EU storage. A full sub-processor list wasn't found in the pages we could read (8 of 20)." } ], "assessment": { "date": "2026-10-08", "basis": "public evidence", "confidence": "medium", "notes": { "ergonomics": "List endpoints take `page` and `limit` (10 to 100), with no field selection. The MCP server lists 127 tools with no documented toolsets (15 of 25). Pagination throughout, and date, event and domain filters on activity, messages and analytics (17). 52 documented error codes that name the fix, and field-level 422 messages (18). No idempotency key for sends. The `x-message-id` header lets a client look a send up before retrying. MCP annotations couldn't be read (5 of 20). Few required fields on a send, template defaults for sender and subject, and official SDKs in six languages (14).", "maintenance": "Python SDK 2.1.1 on 29 September 2026 and Node.js SDK v3.5.0 tagged 23 September (30). In the last 90 days the Node.js SDK had five tagged releases, the Python SDK three and the CLI one (20). The SDK repositories are active with merged pull requests in late September. We couldn't read issue replies, and the product changelog was unread behind a bot check (10 of 15). Current official SDKs in six languages (15). Renovate and a test matrix on Node 20, 22 and 24 in the Node.js SDK. The Python SDK has tests but only a publish workflow, and npm's latest is 3.4.1 while the repository tags 3.5.0 (8 of 10).", "payments": "No x402, MPP or L402 (0). Plan prices and overage per 1,000 emails are public for every plan, $1.50 on Hobby and $1.30 on Starter at 50,000 (20). The 14-day trial starts at signup with 500 emails, but the pricing FAQ says the Free plan asks for a card after approval. Whether the trial needs a card wasn't established, so half (10 of 20). Browser signup and an account approval step before full sending (0).", "reliability": "Graded on the hosted REST API. Status page at status.mailersend.com with ten components and per-component uptime (20). Every component shows 100 per cent for July to October 2026, and the incident feed has no entry after 3 December 2024, with one 30-minute database maintenance scheduled (30). Rate limits published per endpoint, 120 requests a minute on POST /v1/email, with daily quotas by plan (15). A 429 carries retry-after, x-ratelimit and x-apiquota headers, and the docs say to wait the stated seconds. No idempotency key for sends (10 of 15). A 99.5 per cent monthly uptime SLA with service credits from Starter (10). GA (10).", "schema": "OpenAPI 3.1 on SwaggerHub with 59 paths and 97 operations, but no WhatsApp, DMARC or blocklist monitoring paths and no error responses (20 of 25). llms.txt on the docs site and every page served as Markdown at \u003cpath\u003e.md (10). The OpenAPI file has one-line summaries only, while the reference pages state limits and plan conditions per endpoint. The MCP tool definitions can't be read without an account (10 of 20). Parameter tables give type, required and limits, such as 50 To recipients and the nine template languages. The spec has 6 enums (11 of 15). Request examples in up to seven languages and 52 MS error codes with explanations (14). /v1 in the path. The changelog at /whats-new is listed in llms.txt but wasn't read, because the site answered with a bot check (8 of 15).", "security": "API tokens with any of 30 scopes, read or full by area, optionally tied to one sending domain, and pausable or deletable through the API. OAuth with PKCE and dynamic client registration on the MCP server and the CLI (30). Read scopes, token pause and IP allowlisting from Starter. No confirmation step documented for deletes or sends (13 of 20). Inbound mail and activity data carry untrusted content. The terms place responsibility for a connected agent on the customer, and no injection guidance was found in the docs (3 of 15). Email activity logs on every plan for 1 to 30 days, API request logs only on Professional (7 days) and Enterprise (14 days) (9 of 15). A responsible disclosure programme is linked from the legal index, its text unread behind a bot check. No security.txt. The security statement cites ISO 27001 for the data centre and names no SOC 2 or ISO 27001 of MailerSend's own. A guide covers leaked credentials (7 of 20).", "transparency": "Closed service with published terms and MIT SDKs. The terms allow changes to the service and the terms without notice and account closure without cause (17 of 30). The privacy policy (17 September 2026) gives deletion within 30 days of a request, removal of accounts inactive for two years with three email warnings, and EU data centres. Activity retention by plan is on the pricing page. The terms grant a licence to use the inputs and outputs of AI functions to improve AI models, and the Data Processing Addendum was unread behind a bot check (18 of 30). No deprecation policy found in the docs, and the terms reserve change without notice (0). The privacy policy names OpenAI, Google Vertex AI and Google Cloud Translation and states EU storage. A full sub-processor list wasn't found in the pages we could read (8 of 20)." }, "sources": [ { "what": "API general resources, errors, rate limits and quotas", "url": "https://developers.mailersend.com/general", "seen": "2026-10-08" }, { "what": "docs llms.txt", "url": "https://developers.mailersend.com/llms.txt", "seen": "2026-10-08" }, { "what": "send email and bulk email reference", "url": "https://developers.mailersend.com/api/v1/email", "seen": "2026-10-08" }, { "what": "token scopes", "url": "https://developers.mailersend.com/api/v1/account/tokens", "seen": "2026-10-08" }, { "what": "webhook signatures", "url": "https://developers.mailersend.com/api/v1/account/webhooks", "seen": "2026-10-08" }, { "what": "MCP server and tool list", "url": "https://developers.mailersend.com/mcp", "seen": "2026-10-08" }, { "what": "MCP OAuth metadata", "url": "https://mcp.mailersend.com/.well-known/oauth-authorization-server", "seen": "2026-10-08" }, { "what": "CLI docs", "url": "https://developers.mailersend.com/tools/cli", "seen": "2026-10-08" }, { "what": "OpenAPI file", "url": "https://api.swaggerhub.com/apis/MailerSend/mailersend-api/1.0.0-oas3.1", "seen": "2026-10-08" }, { "what": "pricing, plan limits and FAQ", "url": "https://www.mailersend.com/pricing", "seen": "2026-10-08" }, { "what": "status page", "url": "https://status.mailersend.com", "seen": "2026-10-08" }, { "what": "status incident feed", "url": "https://status.mailersend.com/api/v2/incidents.json", "seen": "2026-10-08" }, { "what": "terms of use", "url": "https://www.mailersend.com/legal/terms-of-use", "seen": "2026-10-08" }, { "what": "privacy policy", "url": "https://www.mailersend.com/legal/privacy-policy", "seen": "2026-10-08" }, { "what": "service level agreement", "url": "https://www.mailersend.com/legal/service-level-agreement", "seen": "2026-10-08" }, { "what": "security statement", "url": "https://www.mailersend.com/legal/security-statement", "seen": "2026-10-08" }, { "what": "legal index", "url": "https://www.mailersend.com/legal", "seen": "2026-10-08" }, { "what": "Node.js SDK tags and CI", "url": "https://github.com/mailersend/mailersend-nodejs", "seen": "2026-10-08" }, { "what": "Python SDK tags", "url": "https://github.com/mailersend/mailersend-python", "seen": "2026-10-08" }, { "what": "CLI repository", "url": "https://github.com/mailersend/mailersend-cli", "seen": "2026-10-08" }, { "what": "npm weekly downloads", "url": "https://api.npmjs.org/downloads/point/last-week/mailersend", "seen": "2026-10-08" }, { "what": "PyPI recent downloads", "url": "https://pypistats.org/api/packages/mailersend/recent", "seen": "2026-10-08" } ], "openQuestions": [ "unchecked: the Data Processing Addendum at https://www.mailersend.com/legal/data-processing-addendum, including any sub-processor list. www.mailersend.com answered with a Cloudflare bot check after our first reads", "unchecked: the responsible disclosure programme terms at https://www.mailersend.com/legal/responsible-disclosure-program, including whether rewards are paid", "unchecked: the API use policy at https://www.mailersend.com/legal/api-use-policy", "unchecked: the changelog at https://www.mailersend.com/whats-new, so no dated product entries were counted", "unchecked: whether the 14-day trial needs a card at signup, and how long account approval takes. The help centre is on the same host", "unchecked: the MCP tool definitions, their input schemas and annotations, which need an account to list", "The incident feed on status.mailersend.com has no entry after 3 December 2024. The page was moved to a new provider in February 2026, so we can't tell whether later incidents went unposted", "The lead named MailerLite and Vercom as owners. The terms and privacy policy name only MailerSend, Inc.", "npm serves mailersend 3.4.1 as latest while the repository has a v3.5.0 tag dated 23 September 2026" ] }, "negative": 0, "verdict": "API tokens carry any of 30 scopes and can be tied to one domain, rate limits are published with retry-after on every 429, and a 99.5 per cent SLA starts on the $35 Starter plan. Sends take no idempotency key, the Free plan allows 100 API requests a day, and the terms permit changes without notice.", "bestFor": "An agent sending transactional email for an owner who wants scoped tokens, a hosted MCP server and low entry prices, with SMS and WhatsApp on the same API.", "strengths": [ "API tokens take any of 30 scopes, read or full by area, and can be limited to one sending domain", "Rate limits published per endpoint, with retry-after and x-ratelimit headers on a 429 and a quota endpoint that isn't counted", "99.5 per cent monthly uptime SLA with service credits on Starter, Professional and Enterprise", "Hosted MCP server at mcp.mailersend.com with OAuth, PKCE and dynamic client registration, on every plan", "Overage published per 1,000 emails for each plan, from $1.50 on Hobby to $0.50 at 2 million on Professional" ], "weaknesses": [ "No idempotency key documented for POST /v1/email or the bulk endpoint", "Free plan is capped at 100 API requests a day and 500 emails a month, and asks for a card after account approval", "The terms allow MailerSend to change or end the service and the terms without notice, and to close an account without cause", "The MCP server lists 127 tools with no documented toolsets or read-only mode", "The public OpenAPI file has one-line summaries, no error responses, and no WhatsApp, DMARC or blocklist monitoring paths", "The terms grant MailerSend a licence to use inputs and outputs of its AI functions to improve AI models" ], "agentNotes": [ "Send `Authorization: Bearer \u003ctoken\u003e` to https://api.mailersend.com/v1 and ask for a token with only the scopes the task needs, such as `email_full` and `activity_read`", "Read the message id from the `x-message-id` response header. POST /v1/email answers 202 with an empty body", "Check for a sent message before retrying a send. No idempotency key exists, so a blind retry can deliver twice", "On a 429 wait the seconds in `retry-after`. Call GET /v1/api-quota, which isn't counted, to see the daily quota left", "Use POST /v1/bulk-email for batches of up to 500 emails. It isn't on the Free plan and takes 10 to 60 requests a minute by plan" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 0, "avgRating": 0, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "B", "methodology": "0.4", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 69.5 } ], "editorialScores": { "ergonomics": 69, "maintenance": 83, "payments": 30, "reliability": 95, "schema": 73, "security": 62, "transparency": 43 }, "provenanceScore": 84 }, "connect": { "install": "npm install mailersend", "http": "curl -X POST https://api.mailersend.com/v1/email -H \"Authorization: Bearer $MAILERSEND_API_TOKEN\" \\\n -H \"Content-Type: application/json\" \\\n -d '{\"from\":{\"email\":\"hello@yourdomain.com\"},\"to\":[{\"email\":\"recipient@example.com\"}],\"subject\":\"Hello\",\"text\":\"Hello\"}'", "claudeCode": "claude mcp add --transport http mailersend https://mcp.mailersend.com/mcp" }, "letme": { "capability": "https://letme.dev/email.send", "tool": "https://letme.dev/mailersend" }, "notable": [ "API tokens are created per sending domain with any of 30 scopes, and tokens can be listed, paused and deleted through /v1/token (https://developers.mailersend.com/api/v1/account/tokens)", "Default rate limits are 120 requests a minute on POST /v1/email, 10 on POST /v1/bulk-email, 10 shared by GET /v1/activity and GET /v1/emails, and 60 elsewhere. A 429 carries retry-after and x-ratelimit headers (https://developers.mailersend.com/general)", "Daily API request quota by plan is 100 on Free and the Professional trial, 1,000 on Hobby, 100,000 on Starter and 500,000 on Professional and Enterprise, reset at midnight UTC (https://developers.mailersend.com/general)", "The MCP server is hosted at https://mcp.mailersend.com/mcp over streamable HTTP. An unauthenticated request returns 401 with OAuth resource metadata, and the authorisation server lists a registration endpoint and S256 PKCE (https://developers.mailersend.com/mcp)", "The SLA commits to 99.5 per cent monthly uptime for the communication API, measured in five-minute intervals, with service credits claimed by request. The pricing page lists it from Starter up (https://www.mailersend.com/legal/service-level-agreement)", "Section 21 of the terms covers AI functions and the MCP server. The customer is responsible for a connected agent's actions, and MailerSend takes a licence to use inputs and outputs to improve AI models (https://www.mailersend.com/legal/terms-of-use)", "New accounts go through an approval step. Unapproved accounts are limited to 10 To recipients and a capped number of unique recipients, per the error list (https://developers.mailersend.com/general)", "After our first reads on 8 October 2026, www.mailersend.com answered with a Cloudflare bot check, so the Data Processing Addendum, the responsible disclosure terms, the API use policy and the changelog were not read" ], "area": "communication", "details": [ { "label": "API", "value": "REST at https://api.mailersend.com/v1 with Bearer token. Email, bulk email, activity, analytics, domains, sender identities, inbound routes, messages, scheduled messages, recipients, suppressions, templates, email verification, SMS, WhatsApp, users, tokens, SMTP users, webhooks, DMARC and blocklist monitoring" }, { "label": "Free tier", "value": "Free plan with 500 emails a month, 100 API requests a day, 1 domain, 1 template, 1 webhook and 1 API token. The pricing FAQ says a card is asked for after account approval. A 14-day Professional trial has the same 500 emails and 100 requests a day" }, { "label": "Rate limits", "value": "120 requests a minute on POST /v1/email, 10 on POST /v1/bulk-email by default (10 to 60 by plan), 10 shared by GET /v1/activity and GET /v1/emails, 60 on other endpoints, 120 on SMTP. Daily quota 100, 1,000, 100,000 or 500,000 requests by plan" }, { "label": "Send limits", "value": "50 To, 10 CC and 10 BCC recipients per email on approved accounts, 25 MB per attachment, 2 MB each for text and HTML, 500 emails and 50 MB per bulk request, scheduling up to 72 hours ahead" }, { "label": "Before first send", "value": "Sign up in a browser, pass account approval, then verify a sending domain by DNS or use the trial domain. Create an API token under Settings, API Tokens" }, { "label": "Inbound", "value": "Inbound routes on every plan, managed at /v1/inbound, forwarding parsed mail to a webhook or address" }, { "label": "Webhooks", "value": "Signed with HMAC SHA-256 in a `Signature` header using a per-webhook secret. Events include maintenance.start and maintenance.end. 1 webhook on Free and Hobby, 50 on Starter" }, { "label": "MCP server", "value": "Hosted at https://mcp.mailersend.com/mcp, streamable HTTP, OAuth. 127 tools listed in the docs across email, domains, templates, webhooks, inbound, suppressions, analytics, verification, DMARC, blocklists, tokens, users, identities and SMS, plus search and fetch" }, { "label": "SDKs and CLI", "value": "Official SDKs for PHP, Laravel, Node.js, Python, Go, Ruby and Java, all on GitHub. npm mailersend 3.4.1 and PyPI mailersend 2.1.1 (29 September 2026), both MIT. A CLI (v2.0.0, 18 August 2026) with OAuth or token login and a --json flag" }, { "label": "OpenAPI", "value": "OpenAPI 3.1 on SwaggerHub, version 1.0.0-oas3.1, 59 paths and 97 operations with summaries and request schemas" }, { "label": "Data retention", "value": "Email activity kept 1 day on Free and Hobby, 7 days on Starter, 30 days on Professional and Enterprise. API logs 7 days on Professional and 14 on Enterprise. Deletion on request takes effect within 30 days" }, { "label": "SLA", "value": "99.5 per cent monthly uptime on Starter, Professional and Enterprise, service credits on claim, scheduled maintenance excluded" }, { "label": "Security controls", "value": "Scoped tokens, token pause, IP allowlisting from Starter, two-factor authentication with bulk enforcement on Professional, user roles from Hobby" }, { "label": "Data location", "value": "Data centres in the European Union with ISO 27001 held by the data centre, per the security statement. MailerSend, Inc. is certified under the EU-U.S. Data Privacy Framework" } ], "unitPrices": [ { "item": "Hobby", "unit": "month", "usd": 7, "note": "5,000 emails" }, { "item": "Starter 50k", "unit": "month", "usd": 35, "note": "50,000 emails" }, { "item": "Starter 100k", "unit": "month", "usd": 68, "note": "100,000 emails" }, { "item": "Professional 50k", "unit": "month", "usd": 110, "note": "50,000 emails" }, { "item": "Professional 100k", "unit": "month", "usd": 140, "note": "100,000 emails" }, { "item": "Overage on Hobby", "unit": "1k-emails", "usd": 1.5 }, { "item": "Overage on Starter", "unit": "1k-emails", "usd": 1.3, "note": "up to the 100,000 tier, $1.10 at 250,000 and 500,000, $1.00 at 1 million" }, { "item": "Overage on Professional", "unit": "1k-emails", "usd": 1.3, "note": "up to the 100,000 tier, falling to $0.50 at 2 million" }, { "item": "Email verification credit", "unit": "credit", "usd": 0.01, "note": "1,000 credits for $10, falling to $0.002 at 1 million" }, { "item": "Extra sending domain", "unit": "month", "usd": 4, "note": "per domain, Starter and above" }, { "item": "SMS phone number", "unit": "month", "usd": 2, "note": "per number, USA and Canada, Starter and above" } ], "provenance": { "legalEntity": "MailerSend, Inc.", "domain": "mailersend.com", "domainRegistered": "2009-11-12", "endpointOnVendorDomain": true, "terms": "https://www.mailersend.com/legal/terms-of-use", "privacy": "https://www.mailersend.com/legal/privacy-policy", "statusPage": "https://status.mailersend.com", "changelog": "https://www.mailersend.com/whats-new", "securityTxt": "none", "checked": "2026-10-08", "notes": [ "The terms of use (last updated 5 October 2026) and the privacy policy (last updated 17 September 2026) both name MailerSend, Inc., 228 Park Ave S, PMB 54955, New York, NY 10003-1502. The terms of use are the agreement for the service, with Delaware law.", "The API answers at api.mailersend.com and the MCP server at mcp.mailersend.com.", "www.mailersend.com/.well-known/security.txt returned 404. The legal index links a responsible disclosure programme page.", "The changelog address comes from the site's llms.txt. The page itself was not read, because www.mailersend.com began answering with a Cloudflare bot check during our reads.", "RDAP gives 2009-11-12 as the registration date of mailersend.com.", "The lead named MailerLite and Vercom as parents. The pages we read name only MailerSend, Inc., so no parent is recorded." ], "score": 84, "checks": [ { "check": "Legal entity named", "value": "MailerSend, Inc.", "points": 20, "max": 20, "state": "ok" }, { "check": "Domain age", "value": "mailersend.com, registered 2009-11-12 (16 years)", "points": 15, "max": 15, "state": "ok" }, { "check": "Endpoint on the vendor's domain", "value": "api.mailersend.com", "points": 15, "max": 15, "state": "ok" }, { "check": "Terms of service", "value": "read, states 6 of the 7 things a reader expects, and has 2 clauses that cost points", "points": 5.1, "max": 10, "state": "part" }, { "check": "Privacy policy", "value": "read, states 7 of the 8 things a reader expects", "points": 9.3, "max": 10, "state": "part" }, { "check": "Status page", "value": "status.mailersend.com", "points": 10, "max": 10, "state": "ok" }, { "check": "Changelog", "value": "published", "points": 10, "max": 10, "state": "ok" }, { "check": "security.txt", "value": "not found", "points": 0, "max": 10, "state": "no" } ], "policies": [ { "kind": "terms", "url": "https://www.mailersend.com/legal/terms-of-use", "state": "read", "readAt": "2026-10-08", "statedDate": "2026-10-05", "words": 4810, "points": 5.1, "max": 10, "expected": [ { "key": "terms.date", "label": "Gives the date it was last updated", "found": true, "quote": "Last updated on October 05, 2026", "says": "Last updated 2026-10-05" }, { "key": "terms.law", "label": "Names the governing law or courts", "found": true, "quote": "Except as provided in Clause 24.2 below, these Terms of Use shall be governed by the laws of the State of Delaware, without regard to its conflict of laws principles.", "says": "The law of the State of Delaware" }, { "key": "terms.liability", "label": "States a limit on its liability", "found": true, "quote": "…with this website, or for any indirect, special, incidental or consequential damages (including but not limited to loss of use, loss of profits, revenue, income or anticipated savings, business losses, loss of reputation or goodwill, loss of contracts or business relationships, or loss and/or corruption of information…", "says": "Rules out indirect and consequential losses, with no cap named in this sentence" }, { "key": "terms.termination", "label": "Says how the agreement or account can be ended", "found": true, "quote": "If you violate any of the forgoing, we may suspend or terminate your account." }, { "key": "terms.changes", "label": "Says how changes to the terms are announced", "found": true, "quote": "We reserve the right to modify these Terms of Use at any time without notice.", "says": "Says it gives notice of a change" }, { "key": "terms.use", "label": "Lists what users may not do", "found": true, "quote": "By signing up for or using the site, you accept these Terms and warrant that you meet all the requirements listed in this document, and that you will not use the Services in a way that violates these Terms or any laws or regulations." }, { "key": "terms.sla", "label": "Refers to a service level or uptime commitment", "found": false } ], "toKnow": [ { "key": "training", "label": "Says it may use customer content to train or improve models, and no opt-out was found", "found": true, "quote": "You grant MailerSend a license to use your Inputs and Outputs to improve AI models, and you agree to comply with any restrictions on AI usage.", "costsPoints": true }, { "key": "terms.nonotice", "label": "Says the terms or the service can change without notice", "found": true, "quote": "We may modify or terminate our Services at any time, for any reason, and without notice.", "costsPoints": true }, { "key": "terms.cutoff", "label": "Says access can be ended without notice or for any reason", "found": true, "quote": "We reserve the right to terminate your account at any time with or without cause." }, { "key": "terms.arbitration", "label": "Requires arbitration or waives class actions", "found": true, "quote": "…arising out of or relating to these Terms or the Services will be settled by binding individual arbitration administered by the American Arbitration Association (AAA) in accordance with its Commercial Arbitration Rules and/or the Consumer Arbitration Rules, except that either party may assert claims in small claims co…" } ], "notes": [ { "date": "2026-10-08", "text": "Connecting an AI agent through the MCP server authorises that agent to access, read and possibly modify data in the MailerSend account.", "quote": "When you connect an AI Agent via the MCP, you explicitly authorize that AI Agent to access, read, and potentially modify data within your MailerSend account." }, { "date": "2026-10-08", "text": "Cancelling the account loses all data related to it.", "quote": "In the event of account cancellation, you will lose all data related to your account." }, { "date": "2026-10-08", "text": "Fees and pricing can change at any time, and MailerSend may run pricing experiments that show different rates to some users.", "quote": "We may modify or change our fees and pricing at any time and, at our sole discretion, run in-app beta pricing experiments that offer different rates to some users." } ] }, { "kind": "privacy", "url": "https://www.mailersend.com/legal/privacy-policy", "state": "read", "readAt": "2026-10-08", "statedDate": "2026-09-17", "words": 5575, "points": 9.3, "max": 10, "expected": [ { "key": "privacy.date", "label": "Gives the date it was last updated", "found": true, "quote": "Last updated on September 17, 2026", "says": "Last updated 2026-09-17" }, { "key": "privacy.collected", "label": "Says what personal data is collected", "found": true, "quote": "Information from your use of the Services and information from other sources: we may receive information about how and when you use the Services, store it in log files, or other types of files associated with your account and link it to other information we collect about you." }, { "key": "privacy.retention", "label": "Says how long data is kept", "found": true, "quote": "If MailerSend decides to delete your account, you will be informed via email notifications giving you time to export your data or reactivate your account, such notifications will be sent 30 days, 7 days, and 1 day before the permanent deletion of your data.", "says": "Names a period of 30 days" }, { "key": "privacy.processors", "label": "Says who else receives the data", "found": true, "quote": "When providing SMS services, MailerSend uses third-party SMS service provider Bandwidth to which MailerSend transfers your data." }, { "key": "privacy.sale", "label": "Says whether personal data is sold or shared for advertising", "found": true, "quote": "We will never sell, rent, or lease your Personal Data to a third party, but we may share collected information for the purposes described in this Privacy Policy with third parties, including group companies, that help MailerSend provide, improve, promote or support Services, that help with our business operations and…", "says": "Says it does not sell personal data" }, { "key": "privacy.rights", "label": "Says what rights people have over their data", "found": true, "quote": "You have the right to opt-out of sharing your Personal Data for cross-context behavioral advertising to third parties." }, { "key": "privacy.contact", "label": "Gives a privacy contact", "found": false }, { "key": "privacy.transfers", "label": "Says where data is transferred or stored", "found": true, "quote": "has certified to the Department of Commerce that it adheres to the Data Privacy Framework Principles.", "says": "Relies on the Data Privacy Framework" } ], "toKnow": [ { "key": "privacy.sells", "label": "Says it sells personal data or shares it for advertising", "found": true, "quote": "You have the right to opt-out of sharing your Personal Data for cross-context behavioral advertising to third parties." } ], "notes": [ { "date": "2026-10-08", "text": "Customers' content is submitted to OpenAI and Google Vertex AI to automate the customer approval process.", "quote": "MailerSend uses OpenAI’s technology and Google’s Vertex AI platform to automate the customer approval process by submitting Customers’ content to OpenAI’s technology and Google’s Vertex AI platform." }, { "date": "2026-10-08", "text": "When an AI agent is connected through the MCP, the agent provider's own terms govern its data handling, retention and possible use for model training.", "quote": "When you connect an AI Agent through the MCP, the AI Agent provider's own terms and privacy policy will govern its data handling, retention, and potential use for model training." } ] } ] }, "pageJsonUrl": "https://www.anchorterminal.com/tools/mailersend.json", "live": { "slug": "mailersend", "probe": { "target": "https://api.mailersend.com/v1", "method": "get", "lastAt": "2026-10-08T19:52:54.957453442Z", "lastOk": true, "lastStatus": 200, "lastMs": 151, "authRequired": false, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 182, "p95ms24h": 297, "samples24h": 27, "samples30d": 27, "days": [ { "date": "2026-10-08", "probes": 27, "ok": 27 } ] }, "vendorStatus": { "page": "https://status.mailersend.com", "indicator": "none", "summary": "All Systems Operational", "checkedAt": "2026-10-08T19:50:48.440905505Z" }, "pages": [ { "url": "https://www.mailersend.com/whats-new", "kind": "changelog", "status": 200, "checkedAt": "2026-10-08T18:29:00.187031888Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "573c2146c8b3" }, { "url": "https://www.mailersend.com/pricing", "kind": "pricing", "status": 200, "checkedAt": "2026-10-08T18:28:58.024689641Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "c5c6c75fb124" }, { "url": "https://www.mailersend.com/legal/privacy-policy", "kind": "privacy", "status": 200, "checkedAt": "2026-10-08T18:28:53.837822012Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "be735fa80c7c" }, { "url": "https://www.mailersend.com/legal/terms-of-use", "kind": "terms", "status": 200, "checkedAt": "2026-10-08T18:28:56.046015705Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "7fff1960a381" } ], "updatedAt": "2026-10-08T19:52:54.957453442Z" } }, "verify": { "accepts": "a page on mailersend.com or one of its subdomains, or the README of github.com/mailersend/mailersend-nodejs", "badgeUrl": "https://www.anchorterminal.com/badges/mailersend.svg", "body": { "slug": "mailersend", "url": "the page with the badge or the link" }, "docs": "https://www.anchorterminal.com/builders/#verify", "effect": "none, it never changes a grade, rank or review", "endpoint": "https://www.anchorterminal.com/api/v1/verify", "listingUrl": "https://www.anchorterminal.com/tools/mailersend", "mcpTool": "verify_listing", "recheck": "weekly; two failed checks in a row and it lapses, a later pass restores it", "snippets": { "html": "\u003ca href=\"https://www.anchorterminal.com/tools/mailersend\"\u003e\u003cimg src=\"https://www.anchorterminal.com/badges/mailersend.svg\" alt=\"MailerSend on Anchor Terminal\" height=\"20\"\u003e\u003c/a\u003e", "markdown": "[![MailerSend on Anchor Terminal](https://www.anchorterminal.com/badges/mailersend.svg)](https://www.anchorterminal.com/tools/mailersend)", "link": "\u003ca href=\"https://www.anchorterminal.com/tools/mailersend\"\u003eMailerSend on Anchor Terminal\u003c/a\u003e" } } }, "kind": "anchor.page", "links": { "api": "https://www.anchorterminal.com/api/v1/index.json", "html": "https://www.anchorterminal.com/tools/mailersend", "json": "https://www.anchorterminal.com/tools/mailersend.json", "llms": "https://www.anchorterminal.com/llms.txt", "markdown": "https://www.anchorterminal.com/tools/mailersend.md", "slim": "https://www.anchorterminal.com/tools/mailersend.min.md" }, "markdown": "## Overview\n\n**Grade B · 69.5/100 · rank #156 of 722 · #3 in Email delivery APIs · not agent-ready · confidence medium**\n\n\n## Assessment\n\nAPI tokens carry any of 30 scopes and can be tied to one domain, rate limits are published with retry-after on every 429, and a 99.5 per cent SLA starts on the $35 Starter plan. Sends take no idempotency key, the Free plan allows 100 API requests a day, and the terms permit changes without notice.\n\n## Facts\n\n| Field | Value |\n| --- | --- |\n| Vendor | MailerSend, Inc. (https://www.mailersend.com) |\n| Kind | HTTP API |\n| Category | Email delivery APIs (https://www.anchorterminal.com/categories/email) |\n| Transport | HTTP, Streamable HTTP |\n| Endpoint | `https://api.mailersend.com/v1` |\n| Auth | OAuth or key · The REST API takes a Bearer API token, created in the dashboard or through /v1/token, with any of 30 scopes and an optional sending domain. Tokens can be paused and deleted. SMTP relay uses separate SMTP users. The MCP server and the CLI use OAuth with a browser login, and the MCP authorisation server supports dynamic client registration and PKCE. Access is self-serve, but a new account passes an approval step before full sending. |\n| Pricing | Freemium ($7 / mo) · Free plan with 500 emails a month and 100 API requests a day, which the pricing FAQ says needs a card once the account is approved. A 14-day Professional trial starts at signup with the same limits. Hobby is $7 a month for 5,000 emails, Starter from $35 for 50,000 and Professional from $110 for 50,000, with overage of $0.50 to $1.50 per 1,000. Yearly billing takes 10 per cent off. Enterprise is priced by sales (https://www.mailersend.com/pricing, checked 2026-10-08). |\n| x402 | No · No x402, MPP or L402 in the developer docs, the OpenAPI file or the pricing page (checked 2026-10-08). |\n| Licence | Proprietary service under MailerSend's terms of use. The SDKs and the CLI on GitHub are MIT |\n| Tools exposed | 127 |\n| Packages | npm: `mailersend`; pypi: `mailersend` |\n| Source | https://github.com/mailersend/mailersend-nodejs |\n| Docs | https://developers.mailersend.com |\n| llms.txt | https://developers.mailersend.com/llms.txt |\n| Last release | 2026-09-29 |\n| GitHub stars | 175 (as of 2026-10-08) |\n| npm downloads / week | 128,453 |\n| PyPI downloads / week | 15,086 |\n| API | REST at https://api.mailersend.com/v1 with Bearer token. Email, bulk email, activity, analytics, domains, sender identities, inbound routes, messages, scheduled messages, recipients, suppressions, templates, email verification, SMS, WhatsApp, users, tokens, SMTP users, webhooks, DMARC and blocklist monitoring |\n| Free tier | Free plan with 500 emails a month, 100 API requests a day, 1 domain, 1 template, 1 webhook and 1 API token. The pricing FAQ says a card is asked for after account approval. A 14-day Professional trial has the same 500 emails and 100 requests a day |\n| Rate limits | 120 requests a minute on POST /v1/email, 10 on POST /v1/bulk-email by default (10 to 60 by plan), 10 shared by GET /v1/activity and GET /v1/emails, 60 on other endpoints, 120 on SMTP. Daily quota 100, 1,000, 100,000 or 500,000 requests by plan |\n| Send limits | 50 To, 10 CC and 10 BCC recipients per email on approved accounts, 25 MB per attachment, 2 MB each for text and HTML, 500 emails and 50 MB per bulk request, scheduling up to 72 hours ahead |\n| Before first send | Sign up in a browser, pass account approval, then verify a sending domain by DNS or use the trial domain. Create an API token under Settings, API Tokens |\n| Inbound | Inbound routes on every plan, managed at /v1/inbound, forwarding parsed mail to a webhook or address |\n| Webhooks | Signed with HMAC SHA-256 in a `Signature` header using a per-webhook secret. Events include maintenance.start and maintenance.end. 1 webhook on Free and Hobby, 50 on Starter |\n| MCP server | Hosted at https://mcp.mailersend.com/mcp, streamable HTTP, OAuth. 127 tools listed in the docs across email, domains, templates, webhooks, inbound, suppressions, analytics, verification, DMARC, blocklists, tokens, users, identities and SMS, plus search and fetch |\n| SDKs and CLI | Official SDKs for PHP, Laravel, Node.js, Python, Go, Ruby and Java, all on GitHub. npm mailersend 3.4.1 and PyPI mailersend 2.1.1 (29 September 2026), both MIT. A CLI (v2.0.0, 18 August 2026) with OAuth or token login and a --json flag |\n| OpenAPI | OpenAPI 3.1 on SwaggerHub, version 1.0.0-oas3.1, 59 paths and 97 operations with summaries and request schemas |\n| Data retention | Email activity kept 1 day on Free and Hobby, 7 days on Starter, 30 days on Professional and Enterprise. API logs 7 days on Professional and 14 on Enterprise. Deletion on request takes effect within 30 days |\n| SLA | 99.5 per cent monthly uptime on Starter, Professional and Enterprise, service credits on claim, scheduled maintenance excluded |\n| Security controls | Scoped tokens, token pause, IP allowlisting from Starter, two-factor authentication with bulk enforcement on Professional, user roles from Hobby |\n| Data location | Data centres in the European Union with ISO 27001 held by the data centre, per the security statement. MailerSend, Inc. is certified under the EU-U.S. Data Privacy Framework |\n| Capabilities | email.send, email.inbound, email.templates, email.domains, email.analytics, email.verification, email.threads, messaging.sms, messaging.whatsapp |\n| Tags | hosted, freemium, mcp, oauth, openapi, llms-txt, typescript, python, webhooks, sms, whatsapp, status-page, sla |\n| JSON | https://www.anchorterminal.com/api/v1/tools/mailersend.json |\n\n## Score breakdown (methodology v0.4, October 2026 research run)\n\nAssessed 2026-10-08 from public evidence against the published checklist (https://www.anchorterminal.com/benchmark/#checklist). Confidence: medium. Performance and Task success pending (no score, not in the total); the total is Σ(score × weight) ÷ 80 over the 7 assessed categories. \"This run\" is each category's share of the 100 points.\n\n| Category | Weight | This run | Score (0–100) | Points |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% | 20 | 95 | 19.0 |\n| Performance | 10% | pending | pending | n/a |\n| Schema \u0026 documentation | 13% | 16.2 | 73 | 11.9 |\n| Agent ergonomics | 13% | 16.2 | 69 | 11.2 |\n| Security \u0026 auth | 14% | 17.5 | 62 | 10.8 |\n| Payments \u0026 pricing | 10% | 12.5 | 30 | 3.8 |\n| Task success | 10% | pending | pending | n/a |\n| Maintenance \u0026 community | 7% | 8.8 | 83 | 7.3 |\n| Transparency \u0026 trust (editorial 43, provenance 84) | 7% | 8.8 | 64 | 5.6 |\n| Negative events | up to −15 | up to −15 | none recorded | 0 |\n| **Total** | | | | **69.5 → B** |\n\n### Why each score\n\n- Reliability 95: Graded on the hosted REST API. Status page at status.mailersend.com with ten components and per-component uptime (20). Every component shows 100 per cent for July to October 2026, and the incident feed has no entry after 3 December 2024, with one 30-minute database maintenance scheduled (30). Rate limits published per endpoint, 120 requests a minute on POST /v1/email, with daily quotas by plan (15). A 429 carries retry-after, x-ratelimit and x-apiquota headers, and the docs say to wait the stated seconds. No idempotency key for sends (10 of 15). A 99.5 per cent monthly uptime SLA with service credits from Starter (10). GA (10).\n- Performance: Pending. Latency is measured per call by our probes, which haven't run yet, so this run doesn't score it. Its weight is shared across the assessed categories until the first probe window closes.\n- Schema \u0026 documentation 73: OpenAPI 3.1 on SwaggerHub with 59 paths and 97 operations, but no WhatsApp, DMARC or blocklist monitoring paths and no error responses (20 of 25). llms.txt on the docs site and every page served as Markdown at \u003cpath\u003e.md (10). The OpenAPI file has one-line summaries only, while the reference pages state limits and plan conditions per endpoint. The MCP tool definitions can't be read without an account (10 of 20). Parameter tables give type, required and limits, such as 50 To recipients and the nine template languages. The spec has 6 enums (11 of 15). Request examples in up to seven languages and 52 MS error codes with explanations (14). /v1 in the path. The changelog at /whats-new is listed in llms.txt but wasn't read, because the site answered with a bot check (8 of 15).\n- Agent ergonomics 69: List endpoints take `page` and `limit` (10 to 100), with no field selection. The MCP server lists 127 tools with no documented toolsets (15 of 25). Pagination throughout, and date, event and domain filters on activity, messages and analytics (17). 52 documented error codes that name the fix, and field-level 422 messages (18). No idempotency key for sends. The `x-message-id` header lets a client look a send up before retrying. MCP annotations couldn't be read (5 of 20). Few required fields on a send, template defaults for sender and subject, and official SDKs in six languages (14).\n- Security \u0026 auth 62: API tokens with any of 30 scopes, read or full by area, optionally tied to one sending domain, and pausable or deletable through the API. OAuth with PKCE and dynamic client registration on the MCP server and the CLI (30). Read scopes, token pause and IP allowlisting from Starter. No confirmation step documented for deletes or sends (13 of 20). Inbound mail and activity data carry untrusted content. The terms place responsibility for a connected agent on the customer, and no injection guidance was found in the docs (3 of 15). Email activity logs on every plan for 1 to 30 days, API request logs only on Professional (7 days) and Enterprise (14 days) (9 of 15). A responsible disclosure programme is linked from the legal index, its text unread behind a bot check. No security.txt. The security statement cites ISO 27001 for the data centre and names no SOC 2 or ISO 27001 of MailerSend's own. A guide covers leaked credentials (7 of 20).\n- Payments \u0026 pricing 30: No x402, MPP or L402 (0). Plan prices and overage per 1,000 emails are public for every plan, $1.50 on Hobby and $1.30 on Starter at 50,000 (20). The 14-day trial starts at signup with 500 emails, but the pricing FAQ says the Free plan asks for a card after approval. Whether the trial needs a card wasn't established, so half (10 of 20). Browser signup and an account approval step before full sending (0).\n- Task success: Pending. Task success needs the category task suites run through each tool, which haven't run yet, so this run doesn't score it. Its weight is shared across the assessed categories until then. A data provider's data-quality score is published on its listing now and becomes half of this category when it's scored.\n- Maintenance \u0026 community 83: Python SDK 2.1.1 on 29 September 2026 and Node.js SDK v3.5.0 tagged 23 September (30). In the last 90 days the Node.js SDK had five tagged releases, the Python SDK three and the CLI one (20). The SDK repositories are active with merged pull requests in late September. We couldn't read issue replies, and the product changelog was unread behind a bot check (10 of 15). Current official SDKs in six languages (15). Renovate and a test matrix on Node 20, 22 and 24 in the Node.js SDK. The Python SDK has tests but only a publish workflow, and npm's latest is 3.4.1 while the repository tags 3.5.0 (8 of 10).\n- Transparency \u0026 trust 64: Closed service with published terms and MIT SDKs. The terms allow changes to the service and the terms without notice and account closure without cause (17 of 30). The privacy policy (17 September 2026) gives deletion within 30 days of a request, removal of accounts inactive for two years with three email warnings, and EU data centres. Activity retention by plan is on the pricing page. The terms grant a licence to use the inputs and outputs of AI functions to improve AI models, and the Data Processing Addendum was unread behind a bot check (18 of 30). No deprecation policy found in the docs, and the terms reserve change without notice (0). The privacy policy names OpenAI, Google Vertex AI and Google Cloud Translation and states EU storage. A full sub-processor list wasn't found in the pages we could read (8 of 20).\n\nFix list for a coding agent, everything this grade says the listing lacks, the biggest gain first (19 items): https://www.anchorterminal.com/fixes/mailersend.md (JSON https://www.anchorterminal.com/fixes/mailersend.json)\n\n### What we couldn't check\n\n- unchecked: the Data Processing Addendum at https://www.mailersend.com/legal/data-processing-addendum, including any sub-processor list. www.mailersend.com answered with a Cloudflare bot check after our first reads\n- unchecked: the responsible disclosure programme terms at https://www.mailersend.com/legal/responsible-disclosure-program, including whether rewards are paid\n- unchecked: the API use policy at https://www.mailersend.com/legal/api-use-policy\n- unchecked: the changelog at https://www.mailersend.com/whats-new, so no dated product entries were counted\n- unchecked: whether the 14-day trial needs a card at signup, and how long account approval takes. The help centre is on the same host\n- unchecked: the MCP tool definitions, their input schemas and annotations, which need an account to list\n- The incident feed on status.mailersend.com has no entry after 3 December 2024. The page was moved to a new provider in February 2026, so we can't tell whether later incidents went unposted\n- The lead named MailerLite and Vercom as owners. The terms and privacy policy name only MailerSend, Inc.\n- npm serves mailersend 3.4.1 as latest while the repository has a v3.5.0 tag dated 23 September 2026\n\n### Sources\n\n- API general resources, errors, rate limits and quotas: \u003chttps://developers.mailersend.com/general\u003e (seen 2026-10-08)\n- docs llms.txt: \u003chttps://developers.mailersend.com/llms.txt\u003e (seen 2026-10-08)\n- send email and bulk email reference: \u003chttps://developers.mailersend.com/api/v1/email\u003e (seen 2026-10-08)\n- token scopes: \u003chttps://developers.mailersend.com/api/v1/account/tokens\u003e (seen 2026-10-08)\n- webhook signatures: \u003chttps://developers.mailersend.com/api/v1/account/webhooks\u003e (seen 2026-10-08)\n- MCP server and tool list: \u003chttps://developers.mailersend.com/mcp\u003e (seen 2026-10-08)\n- MCP OAuth metadata: \u003chttps://mcp.mailersend.com/.well-known/oauth-authorization-server\u003e (seen 2026-10-08)\n- CLI docs: \u003chttps://developers.mailersend.com/tools/cli\u003e (seen 2026-10-08)\n- OpenAPI file: \u003chttps://api.swaggerhub.com/apis/MailerSend/mailersend-api/1.0.0-oas3.1\u003e (seen 2026-10-08)\n- pricing, plan limits and FAQ: \u003chttps://www.mailersend.com/pricing\u003e (seen 2026-10-08)\n- status page: \u003chttps://status.mailersend.com\u003e (seen 2026-10-08)\n- status incident feed: \u003chttps://status.mailersend.com/api/v2/incidents.json\u003e (seen 2026-10-08)\n- terms of use: \u003chttps://www.mailersend.com/legal/terms-of-use\u003e (seen 2026-10-08)\n- privacy policy: \u003chttps://www.mailersend.com/legal/privacy-policy\u003e (seen 2026-10-08)\n- service level agreement: \u003chttps://www.mailersend.com/legal/service-level-agreement\u003e (seen 2026-10-08)\n- security statement: \u003chttps://www.mailersend.com/legal/security-statement\u003e (seen 2026-10-08)\n- legal index: \u003chttps://www.mailersend.com/legal\u003e (seen 2026-10-08)\n- Node.js SDK tags and CI: \u003chttps://github.com/mailersend/mailersend-nodejs\u003e (seen 2026-10-08)\n- Python SDK tags: \u003chttps://github.com/mailersend/mailersend-python\u003e (seen 2026-10-08)\n- CLI repository: \u003chttps://github.com/mailersend/mailersend-cli\u003e (seen 2026-10-08)\n- npm weekly downloads: \u003chttps://api.npmjs.org/downloads/point/last-week/mailersend\u003e (seen 2026-10-08)\n- PyPI recent downloads: \u003chttps://pypistats.org/api/packages/mailersend/recent\u003e (seen 2026-10-08)\n\n## Who's behind it (provenance 84/100, checked 2026-10-08)\n\n| Check | Finding | Points |\n| --- | --- | --- |\n| Legal entity named | MailerSend, Inc. | 20/20 |\n| Domain age | mailersend.com, registered 2009-11-12 (16 years) | 15/15 |\n| Endpoint on the vendor's domain | api.mailersend.com | 15/15 |\n| Terms of service | read, states 6 of the 7 things a reader expects, and has 2 clauses that cost points | 5.1/10 |\n| Privacy policy | read, states 7 of the 8 things a reader expects | 9.3/10 |\n| Status page | status.mailersend.com | 10/10 |\n| Changelog | published | 10/10 |\n| security.txt | not found | 0/10 |\n\nThe terms of use (last updated 5 October 2026) and the privacy policy (last updated 17 September 2026) both name MailerSend, Inc., 228 Park Ave S, PMB 54955, New York, NY 10003-1502. The terms of use are the agreement for the service, with Delaware law.\n\nThe API answers at api.mailersend.com and the MCP server at mcp.mailersend.com.\n\nwww.mailersend.com/.well-known/security.txt returned 404. The legal index links a responsible disclosure programme page.\n\nThe changelog address comes from the site's llms.txt. The page itself was not read, because www.mailersend.com began answering with a Cloudflare bot check during our reads.\n\nRDAP gives 2009-11-12 as the registration date of mailersend.com.\n\nThe lead named MailerLite and Vercom as parents. The pages we read name only MailerSend, Inc., so no parent is recorded.\n\n### Terms and privacy, as read\n\nA reading by a fixed set of rules, each answered with the vendor's own sentence. Not legal advice.\n\n**Terms of service** (https://www.mailersend.com/legal/terms-of-use), read 2026-10-08, dated 2026-10-05, states 6 of the 7 things a reader expects.\n\n- To know. Says it may use customer content to train or improve models, and no opt-out was found (costs points). \"You grant MailerSend a license to use your Inputs and Outputs to improve AI models, and you agree to comply with any restrictions on AI usage.\"\n- To know. Says the terms or the service can change without notice (costs points). \"We may modify or terminate our Services at any time, for any reason, and without notice.\"\n- To know. Says access can be ended without notice or for any reason. \"We reserve the right to terminate your account at any time with or without cause.\"\n- To know. Requires arbitration or waives class actions. \"…arising out of or relating to these Terms or the Services will be settled by binding individual arbitration administered by the American Arbitration Association (AAA) in accordance with its Commercial Arbitration Rules and/or the Consumer Arbitration Rules, except that either party may assert claims in small claims co…\"\n- Gives the date it was last updated. Last updated 2026-10-05.\n- Names the governing law or courts. The law of the State of Delaware.\n- States a limit on its liability. Rules out indirect and consequential losses, with no cap named in this sentence.\n- Says how changes to the terms are announced. Says it gives notice of a change.\n- Not found in the text. Refers to a service level or uptime commitment.\n- Also in the text (2026-10-08). Connecting an AI agent through the MCP server authorises that agent to access, read and possibly modify data in the MailerSend account. \"When you connect an AI Agent via the MCP, you explicitly authorize that AI Agent to access, read, and potentially modify data within your MailerSend account.\"\n- Also in the text (2026-10-08). Cancelling the account loses all data related to it. \"In the event of account cancellation, you will lose all data related to your account.\"\n- Also in the text (2026-10-08). Fees and pricing can change at any time, and MailerSend may run pricing experiments that show different rates to some users. \"We may modify or change our fees and pricing at any time and, at our sole discretion, run in-app beta pricing experiments that offer different rates to some users.\"\n\n**Privacy policy** (https://www.mailersend.com/legal/privacy-policy), read 2026-10-08, dated 2026-09-17, states 7 of the 8 things a reader expects.\n\n- To know. Says it sells personal data or shares it for advertising. \"You have the right to opt-out of sharing your Personal Data for cross-context behavioral advertising to third parties.\"\n- Gives the date it was last updated. Last updated 2026-09-17.\n- Says how long data is kept. Names a period of 30 days.\n- Says whether personal data is sold or shared for advertising. Says it does not sell personal data.\n- Not found in the text. Gives a privacy contact.\n- Says where data is transferred or stored. Relies on the Data Privacy Framework.\n- Also in the text (2026-10-08). Customers' content is submitted to OpenAI and Google Vertex AI to automate the customer approval process. \"MailerSend uses OpenAI’s technology and Google’s Vertex AI platform to automate the customer approval process by submitting Customers’ content to OpenAI’s technology and Google’s Vertex AI platform.\"\n- Also in the text (2026-10-08). When an AI agent is connected through the MCP, the agent provider's own terms govern its data handling, retention and possible use for model training. \"When you connect an AI Agent through the MCP, the AI Agent provider's own terms and privacy policy will govern its data handling, retention, and potential use for model training.\"\n\n## Live (updated 2026-10-08 19:52 UTC)\n\n- Right now: up, HTTP 200, 151 ms, checked 2026-10-08 19:52 UTC (get on `https://api.mailersend.com/v1`)\n- Uptime 24h 100.0% (27 probes) · 30 days 100.0% (27 probes) · p50 182 ms · p95 297 ms\n- Vendor status page: none, All Systems Operational\n- Watching changelog \u003chttps://www.mailersend.com/whats-new\u003e\n- Watching pricing \u003chttps://www.mailersend.com/pricing\u003e\n- Watching privacy \u003chttps://www.mailersend.com/legal/privacy-policy\u003e\n- Watching terms \u003chttps://www.mailersend.com/legal/terms-of-use\u003e\n- Always current: https://www.anchorterminal.com/api/v1/live/mailersend.json\n\n## Probe metrics\n\nNot measured yet. Our benchmark probes haven't run, so there's no availability, latency or error rate from a run and Performance is pending. Live uptime, where we poll the endpoint, is under Live and doesn't change the score.\n\n## Prices\n\n| Item | Price | Unit | Note |\n| --- | --- | --- | --- |\n| Hobby | $7 | per month (plan) | 5,000 emails |\n| Starter 50k | $35 | per month (plan) | 50,000 emails |\n| Starter 100k | $68 | per month (plan) | 100,000 emails |\n| Professional 50k | $110 | per month (plan) | 50,000 emails |\n| Professional 100k | $140 | per month (plan) | 100,000 emails |\n| Overage on Hobby | $1.50 | per 1,000 emails | |\n| Overage on Starter | $1.30 | per 1,000 emails | up to the 100,000 tier, $1.10 at 250,000 and 500,000, $1.00 at 1 million |\n| Overage on Professional | $1.30 | per 1,000 emails | up to the 100,000 tier, falling to $0.50 at 2 million |\n| Email verification credit | $0.01 | per credit | 1,000 credits for $10, falling to $0.002 at 1 million |\n| Extra sending domain | $4 | per month (plan) | per domain, Starter and above |\n| SMS phone number | $2 | per month (plan) | per number, USA and Canada, Starter and above |\n\nAcross all listings: https://www.anchorterminal.com/prices/index.md\n\n## Strengths\n\n- API tokens take any of 30 scopes, read or full by area, and can be limited to one sending domain\n- Rate limits published per endpoint, with retry-after and x-ratelimit headers on a 429 and a quota endpoint that isn't counted\n- 99.5 per cent monthly uptime SLA with service credits on Starter, Professional and Enterprise\n- Hosted MCP server at mcp.mailersend.com with OAuth, PKCE and dynamic client registration, on every plan\n- Overage published per 1,000 emails for each plan, from $1.50 on Hobby to $0.50 at 2 million on Professional\n\n## Weaknesses\n\n- No idempotency key documented for POST /v1/email or the bulk endpoint\n- Free plan is capped at 100 API requests a day and 500 emails a month, and asks for a card after account approval\n- The terms allow MailerSend to change or end the service and the terms without notice, and to close an account without cause\n- The MCP server lists 127 tools with no documented toolsets or read-only mode\n- The public OpenAPI file has one-line summaries, no error responses, and no WhatsApp, DMARC or blocklist monitoring paths\n- The terms grant MailerSend a licence to use inputs and outputs of its AI functions to improve AI models\n\n## Before you call it (notes for agents)\n\n1. Send `Authorization: Bearer \u003ctoken\u003e` to https://api.mailersend.com/v1 and ask for a token with only the scopes the task needs, such as `email_full` and `activity_read`\n2. Read the message id from the `x-message-id` response header. POST /v1/email answers 202 with an empty body\n3. Check for a sent message before retrying a send. No idempotency key exists, so a blind retry can deliver twice\n4. On a 429 wait the seconds in `retry-after`. Call GET /v1/api-quota, which isn't counted, to see the daily quota left\n5. Use POST /v1/bulk-email for batches of up to 500 emails. It isn't on the Free plan and takes 10 to 60 requests a minute by plan\n\n## Connect\n\nInstall:\n\n```bash\nnpm install mailersend\n```\n\nFirst request:\n\n```bash\ncurl -X POST https://api.mailersend.com/v1/email -H \"Authorization: Bearer $MAILERSEND_API_TOKEN\" \\\n -H \"Content-Type: application/json\" \\\n -d '{\"from\":{\"email\":\"hello@yourdomain.com\"},\"to\":[{\"email\":\"recipient@example.com\"}],\"subject\":\"Hello\",\"text\":\"Hello\"}'\n```\n\nClaude Code:\n\n```bash\nclaude mcp add --transport http mailersend https://mcp.mailersend.com/mcp\n```\n\nThrough letme (picks today, calling later): https://letme.dev/mailersend (letme picks it for email.verification, the top-graded tool for the job). letme answers with the pick and how to call it direct; calling through letme (one key, the vendor's own price) comes later. How it works: https://www.anchorterminal.com/letme/index.md\n\n## Similar tools\n\nRanked by shared capabilities, then score. Same-category tools with no shared capability key are listed last.\n\n| Tool | Grade | Score | Rank | Shared capabilities | x402 | Markdown |\n| --- | --- | --- | --- | --- | --- | --- |\n| Mailtrap Email API + MCP | B | 66.8 | 228 | email.send, email.inbound, email.templates, email.domains, email.analytics, email.threads | no | https://www.anchorterminal.com/tools/mailtrap.md |\n| Amazon SES | BB | 75.1 | 48 | email.send, email.inbound, email.templates, email.domains, email.analytics | no | https://www.anchorterminal.com/tools/amazon-ses.md |\n| Resend API + MCP | BB | 75.1 | 50 | email.send, email.inbound, email.templates, email.domains, email.analytics | no | https://www.anchorterminal.com/tools/resend.md |\n| AgentMail API + MCP | BB | 74.9 | 55 | email.send, email.inbound, email.threads, email.domains, email.analytics | yes | https://www.anchorterminal.com/tools/agentmail.md |\n| Postmark API + MCP | B | 66.5 | 235 | email.send, email.inbound, email.templates, email.domains, email.analytics | no | https://www.anchorterminal.com/tools/postmark.md |\n| Mailgun API + MCP | B | 66.2 | 242 | email.send, email.inbound, email.templates, email.domains, email.analytics | no | https://www.anchorterminal.com/tools/mailgun.md |\n\n## Panel reviews (0)\n\nReviewed by the Anchor panel (https://www.anchorterminal.com/reviewers/index.md): .\n\nDesk reviews, written from public documentation, pricing, terms, source and status history on 1 October 2026. No calls made. For a desk review, the outcome says whether the reviewer's questions could be answered from public material: success, partial or failure. How reviews work: https://www.anchorterminal.com/reviews/how-it-works.md\n\n## Notable\n\n- API tokens are created per sending domain with any of 30 scopes, and tokens can be listed, paused and deleted through /v1/token (source: \u003chttps://developers.mailersend.com/api/v1/account/tokens\u003e)\n- Default rate limits are 120 requests a minute on POST /v1/email, 10 on POST /v1/bulk-email, 10 shared by GET /v1/activity and GET /v1/emails, and 60 elsewhere. A 429 carries retry-after and x-ratelimit headers (source: \u003chttps://developers.mailersend.com/general\u003e)\n- Daily API request quota by plan is 100 on Free and the Professional trial, 1,000 on Hobby, 100,000 on Starter and 500,000 on Professional and Enterprise, reset at midnight UTC (source: \u003chttps://developers.mailersend.com/general\u003e)\n- The MCP server is hosted at https://mcp.mailersend.com/mcp over streamable HTTP. An unauthenticated request returns 401 with OAuth resource metadata, and the authorisation server lists a registration endpoint and S256 PKCE (source: \u003chttps://developers.mailersend.com/mcp\u003e)\n- The SLA commits to 99.5 per cent monthly uptime for the communication API, measured in five-minute intervals, with service credits claimed by request. The pricing page lists it from Starter up (source: \u003chttps://www.mailersend.com/legal/service-level-agreement\u003e)\n- Section 21 of the terms covers AI functions and the MCP server. The customer is responsible for a connected agent's actions, and MailerSend takes a licence to use inputs and outputs to improve AI models (source: \u003chttps://www.mailersend.com/legal/terms-of-use\u003e)\n- New accounts go through an approval step. Unapproved accounts are limited to 10 To recipients and a capped number of unique recipients, per the error list (source: \u003chttps://developers.mailersend.com/general\u003e)\n- After our first reads on 8 October 2026, www.mailersend.com answered with a Cloudflare bot check, so the Data Processing Addendum, the responsible disclosure terms, the API use policy and the changelog were not read\n\n## Compare\n\n- [Amazon SES vs MailerSend](https://www.anchorterminal.com/compare/amazon-ses-vs-mailersend.md): BB 75.1 vs B 69.5\n- [Brevo API + MCP vs MailerSend](https://www.anchorterminal.com/compare/brevo-vs-mailersend.md): E 44.8 vs B 69.5\n- [Cloudflare Email Service vs MailerSend](https://www.anchorterminal.com/compare/cloudflare-email-service-vs-mailersend.md): B 67.3 vs B 69.5\n- [Loops API + MCP vs MailerSend](https://www.anchorterminal.com/compare/loops-vs-mailersend.md): B 62.7 vs B 69.5\n- [MailerSend vs Mailgun API + MCP](https://www.anchorterminal.com/compare/mailersend-vs-mailgun.md): B 69.5 vs B 66.2\n- [MailerSend vs Mailjet API + MCP](https://www.anchorterminal.com/compare/mailersend-vs-mailjet.md): B 69.5 vs C 59.4\n- [MailerSend vs Mailtrap Email API + MCP](https://www.anchorterminal.com/compare/mailersend-vs-mailtrap.md): B 69.5 vs B 66.8\n- [MailerSend vs Mailchimp Transactional (Mandrill)](https://www.anchorterminal.com/compare/mailersend-vs-mandrill.md): B 69.5 vs C 58.1\n- [MailerSend vs Postmark API + MCP](https://www.anchorterminal.com/compare/mailersend-vs-postmark.md): B 69.5 vs B 66.5\n- [MailerSend vs Resend API + MCP](https://www.anchorterminal.com/compare/mailersend-vs-resend.md): B 69.5 vs BB 75.1\n- [MailerSend vs Twilio SendGrid](https://www.anchorterminal.com/compare/mailersend-vs-sendgrid.md): B 69.5 vs B 63.6\n- [MailerSend vs SMTP2GO API + MCP](https://www.anchorterminal.com/compare/mailersend-vs-smtp2go.md): B 69.5 vs D 53.1\n- [MailerSend vs Zoho CPaaS (formerly ZeptoMail)](https://www.anchorterminal.com/compare/mailersend-vs-zoho-zeptomail.md): B 69.5 vs C 61.8\n\n## Verify this listing\n\nFor the vendor. The badge or a plain link to this page verifies the listing, from a page on mailersend.com or one of its subdomains, or the README of github.com/mailersend/mailersend-nodejs. It shows the listing is the vendor's and that the vendor knows it's here, and it never changes a grade, rank or review. The vendor sends the page's address to `POST https://www.anchorterminal.com/api/v1/verify` as `{\"slug\": \"mailersend\", \"url\": \"…\"}`, or calls the `verify_listing` tool at https://www.anchorterminal.com/mcp. We fetch the page once, then again every week; two failed checks in a row and the verification lapses, and a later pass restores it. What we check: https://www.anchorterminal.com/builders/index.md#verify\n\nHTML badge:\n\n```html\n\u003ca href=\"https://www.anchorterminal.com/tools/mailersend\"\u003e\u003cimg src=\"https://www.anchorterminal.com/badges/mailersend.svg\" alt=\"MailerSend on Anchor Terminal\" height=\"20\"\u003e\u003c/a\u003e\n```\n\nMarkdown badge, for a README:\n\n```markdown\n[![MailerSend on Anchor Terminal](https://www.anchorterminal.com/badges/mailersend.svg)](https://www.anchorterminal.com/tools/mailersend)\n```\n\nPlain link:\n\n```html\n\u003ca href=\"https://www.anchorterminal.com/tools/mailersend\"\u003eMailerSend on Anchor Terminal\u003c/a\u003e\n```\n\n## Share this listing\n\nFor the vendor. Sharing assets for social media, two PNGs of 1200 × 630 that say MailerSend is listed on Anchor Terminal, with the vendor's logo and this page's address and no grade or score.\n\n- Dark: https://www.anchorterminal.com/assets/share/mailersend-dark.png\n- Light: https://www.anchorterminal.com/assets/share/mailersend-light.png\n", "meta": { "attribution": "Anchor Terminal (https://www.anchorterminal.com)", "docs": "https://www.anchorterminal.com/docs/", "generatedAt": "2026-10-08", "license": "CC-BY-4.0", "method": "https://www.anchorterminal.com/benchmark/", "methodology": "0.4", "openapi": "https://www.anchorterminal.com/openapi.json", "preview": false, "run": "2026-10-01", "runLabel": "October 2026 research run" }, "page": { "breadcrumbs": [ { "name": "Home", "url": "https://www.anchorterminal.com/" }, { "name": "Terminal", "url": "https://www.anchorterminal.com/tools/" }, { "name": "Email delivery APIs", "url": "https://www.anchorterminal.com/categories/email" }, { "name": "MailerSend", "url": "" } ], "description": "Transactional email service from MailerSend, Inc. with a REST API, SMTP relay, templates, inbound routing, webhooks and analytics, plus SMS and WhatsApp sending. Agents reach it with a scoped API token or through a hosted MCP server.", "facts": [ "rank #156 of 722", "OAuth or key auth", "0 desk reviews" ], "h1": "MailerSend", "image": "https://www.anchorterminal.com/assets/og/tools-mailersend.png", "path": "/tools/mailersend", "published": "2026-10-01", "section": "tools", "title": "MailerSend review for AI agents, grade B (69.5/100) | Anchor Terminal", "toc": null, "updated": "2026-10-08", "url": "https://www.anchorterminal.com/tools/mailersend" }, "tokens": { "markdown": 8300, "slim": 2130 }, "version": 1 }