{ "data": { "a": { "slug": "mailtrap", "name": "Mailtrap Email API + MCP", "vendor": "Mailtrap (Railsware)", "vendorUrl": "https://mailtrap.io", "kind": "http-api", "category": "email", "summary": "Email platform from Railsware Products Studio LLC for transactional and bulk sending, inbound mail, templates, contacts and sandbox testing. Agents reach it through a REST API, SMTP, SDKs, a CLI and a local MCP server.", "url": "https://www.anchorterminal.com/tools/mailtrap", "markdownUrl": "https://www.anchorterminal.com/tools/mailtrap.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/mailtrap.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/mailtrap.json", "repo": "https://github.com/mailtrap/mailtrap-mcp", "license": "Proprietary service under Mailtrap's terms of service. The MCP server, the Node.js SDK and the CLI are MIT", "transports": [ "http", "stdio" ], "remoteUrl": "https://send.api.mailtrap.io", "packages": [ { "registry": "npm", "name": "mailtrap" }, { "registry": "npm", "name": "mcp-mailtrap" }, { "registry": "pypi", "name": "mailtrap" } ], "auth": "api-key", "authNotes": "Self-serve API token, sent as `Authorization: Bearer` or in the `Api-Token` header. Tokens are created at mailtrap.io/settings/api-tokens with permissions per resource and an expiry of 1 to 365 days or a custom date (365 by default). A reset leaves the old token valid for 12 hours. The first token is made by hand in the UI, and later ones can be managed through the API. The MCP server reads `MAILTRAP_API_TOKEN`, and the sub-account tools need a separate organisation token.", "pricing": "freemium", "pricingNotes": "Free plan of 4,000 emails a month, capped at 150 a day, and the vendor says signup needs no credit card. Basic is $15 a month for 10,000 emails, Business starts at $85 for 100,000 and Enterprise at $750 for 1,500,000. Overage per 1,000 emails is $1.00, $0.88 and $0.55, and the free plan has none. Email Sandbox and Email Marketing are priced separately (https://mailtrap.io/pricing.md, checked 2026-10-08).", "priceSummary": "$15 / mo", "where": "both", "x402": { "level": "no", "evidence": "No x402, MPP or L402 in the docs index, the pricing reference, the OpenAPI specs or the MCP README (checked 2026-10-08).", "endpoints": [] }, "toolCount": 125, "popularity": { "githubStars": 65, "npmWeekly": 65939, "pypiWeekly": 21317, "asOf": "2026-10-08" }, "docsUrl": "https://docs.mailtrap.io/", "llmsTxt": "https://docs.mailtrap.io/llms.txt", "openapi": "https://github.com/mailtrap/mailtrap-openapi", "registryName": "io.mailtrap/mcp", "capabilities": [ "email.send", "email.inbound", "email.templates", "email.domains", "email.analytics", "email.marketing", "email.inbox", "email.threads" ], "tags": [ "hosted", "freemium", "no-card", "mcp", "openapi", "llms-txt", "cli", "smtp", "typescript", "python", "webhooks", "sandbox", "status-page", "soc2", "iso27001" ], "lastRelease": "2026-10-08", "graded": true, "anchor": { "graded": true, "score": 66.8, "grade": "B", "agentReady": false, "rank": 228, "ranked": true, "rankOf": 722, "categoryRank": 5, "methodology": "0.4", "run": "2026-10-01", "scores": { "ergonomics": 62, "maintenance": 93, "payments": 40, "reliability": 65, "schema": 82, "security": 60, "transparency": 77 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-10-08" }, "negative": 0, "verdict": "Public OpenAPI 3.1 specs, API tokens with per-resource permissions and expiry dates, and a free plan of 4,000 emails a month without a card support agent use. The MCP server loads 125 tools with no toolsets, no idempotency key was found for sends, and the status page records a sending outage of 1 hour 32 minutes on 1 August 2026.", "bestFor": "Teams that want sending, a test sandbox and inbound mail under one token, with public OpenAPI specs and a free plan.", "strengths": [ "Ten public OpenAPI 3.1 specs in mailtrap/mailtrap-openapi, plus llms.txt, llms-full.txt and a Markdown copy of every docs page", "API tokens carry per-resource permissions and an expiry date (365 days by default), and a reset keeps the old token valid for 12 hours", "Free plan of 4,000 emails a month, with signup stated as needing no credit card, and overage rates published per 1,000 emails", "Every MCP tool is annotated, 53 with readOnlyHint and the other 72 with destructiveHint set true or false", "Email Sandbox captures test sends without delivering them, through the same API token and SDK switch" ], "weaknesses": [ "The MCP server registers 125 tools at once, with no toolsets, filtering or read-only mode", "No idempotency key for sends was found in the OpenAPI specs or the docs", "The status page records a sending outage of 1 hour 32 minutes on 1 August 2026 covering the Email Sending API, SMTP and Inbound Email", "Inbound and sandbox message bodies reach the model through the MCP server, and no prompt-injection guidance was found in its README or the docs", "User audit logs are limited to the Enterprise plan, and the free plan keeps email logs for 3 days" ], "agentNotes": [ "Ask the operator to create the first API token at mailtrap.io/settings/api-tokens. The first token can't be created through the API.", "Send transactional mail to send.api.mailtrap.io and bulk mail to bulk.api.mailtrap.io. Sandbox sending uses a different base URL and an inbox ID.", "Verify a sending domain before the first production send, and use Email Sandbox to test payloads without delivery.", "Stay under 150 requests per 10 seconds per token, and 10 per 60 seconds per account on the Stats and Suppressions APIs. On 429, back off until `x-ratelimit-reset`.", "Don't retry a timed-out send blindly, because no idempotency key was found. Check the email logs first." ], "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": 66.8 } ], "editorialScores": { "ergonomics": 62, "maintenance": 93, "payments": 40, "reliability": 65, "schema": 82, "security": 60, "transparency": 66 }, "provenanceScore": 87 }, "connect": { "install": "npm install mailtrap", "http": "curl -X POST https://send.api.mailtrap.io/api/send \\\n -H 'Authorization: Bearer YOUR_API_KEY' \\\n -H 'Content-Type: application/json' \\\n -d '{\n \"from\": {\"email\": \"sender@example.com\"},\n \"to\": [{\"email\": \"recipient@example.com\"}],\n \"subject\": \"Hello from Mailtrap\",\n \"text\": \"Welcome to Mailtrap!\"\n }'", "config": { "mcpServers": { "mailtrap": { "args": [ "-y", "mcp-mailtrap" ], "command": "npx", "env": { "DEFAULT_FROM_EMAIL": "your_sender@example.com", "MAILTRAP_ACCOUNT_ID": "your_account_id", "MAILTRAP_API_TOKEN": "your_mailtrap_api_token", "MAILTRAP_SANDBOX_ID": "your_sandbox_id" } } } } }, "letme": { "capability": "https://letme.dev/email.send", "tool": "https://letme.dev/mailtrap" }, "area": "communication", "unitPrices": [ { "item": "Basic 10k", "unit": "month", "usd": 15, "note": "10,000 emails" }, { "item": "Basic 100k", "unit": "month", "usd": 30, "note": "100,000 emails" }, { "item": "Business 100k", "unit": "month", "usd": 85, "note": "100,000 emails" }, { "item": "Enterprise 1.5M", "unit": "month", "usd": 750, "note": "1,500,000 emails" }, { "item": "Overage on Basic", "unit": "1k-emails", "usd": 1 }, { "item": "Overage on Business", "unit": "1k-emails", "usd": 0.88 }, { "item": "Overage on Enterprise", "unit": "1k-emails", "usd": 0.55 } ], "provenance": { "legalEntity": "Railsware Products Studio LLC", "domain": "mailtrap.io", "domainRegistered": "2011-10-06", "endpointOnVendorDomain": true, "terms": "https://mailtrap.io/terms/", "privacy": "https://mailtrap.io/privacy/", "statusPage": "https://status.mailtrap.info", "changelog": "https://feedback.mailtrap.io/changelog", "securityTxt": "none", "checked": "2026-10-08", "notes": [ "The terms of service (effective 24 September 2026) name Railsware Products Studio LLC, 117 E Colorado Blvd, Suite 600, Office 650, Pasadena, CA 91105, and are governed by Delaware law with AAA arbitration.", "The privacy policy and the data processing addendum at mailtrap.io/dpa are both dated 24 September 2026.", "The sending API answers at send.api.mailtrap.io and bulk.api.mailtrap.io. The status page is on a separate domain, status.mailtrap.info, hosted by Sorry.", "mailtrap.io/.well-known/security.txt returns 404.", "RDAP for mailtrap.io gives a registration date of 2011-10-06." ], "score": 87 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/mailtrap.json", "live": { "slug": "mailtrap", "probe": { "target": "https://send.api.mailtrap.io", "method": "get", "lastAt": "2026-10-08T19:52:55.182875963Z", "lastOk": true, "lastStatus": 404, "lastMs": 388, "authRequired": false, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 414, "p95ms24h": 468, "samples24h": 27, "samples30d": 27, "days": [ { "date": "2026-10-08", "probes": 27, "ok": 27 } ] }, "vendorStatus": { "page": "https://status.mailtrap.info", "indicator": "unknown", "summary": "no machine-readable status found", "checkedAt": "2026-10-08T19:38:46.22405333Z" }, "pages": [ { "url": "https://feedback.mailtrap.io/changelog", "kind": "changelog", "status": 200, "checkedAt": "2026-10-08T18:20:18.491752089Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "e3acdfa7f8c4" }, { "url": "https://mailtrap.io/pricing.md", "kind": "pricing", "status": 200, "checkedAt": "2026-10-08T18:21:50.026823293Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "fb22f75ee67f" }, { "url": "https://mailtrap.io/privacy/", "kind": "privacy", "status": 200, "checkedAt": "2026-10-08T18:21:52.480729163Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "b8aafb804ef9" }, { "url": "https://mailtrap.io/terms/", "kind": "terms", "status": 200, "checkedAt": "2026-10-08T18:21:54.495970731Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "1c4fcbf64dac" } ], "updatedAt": "2026-10-08T19:52:55.182875963Z" } }, "answer": "Mailtrap Email API + MCP and Postmark API + MCP score within a point of each other on agent readiness, 66.8 (B) and 66.5 (B). Postmark API + MCP leads on agent ergonomics.", "b": { "slug": "postmark", "name": "Postmark API + MCP", "vendor": "Postmark (ActiveCampaign)", "vendorUrl": "https://postmarkapp.com", "kind": "http-api", "category": "email", "summary": "Transactional email API with separate broadcast streams, templates, inbound parsing and bounce handling.", "url": "https://www.anchorterminal.com/tools/postmark", "markdownUrl": "https://www.anchorterminal.com/tools/postmark.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/postmark.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/postmark.json", "repo": "https://github.com/ActiveCampaign/postmark-mcp", "license": "MIT", "transports": [ "http", "stdio" ], "remoteUrl": "https://api.postmarkapp.com", "packages": [ { "registry": "npm", "name": "postmark" }, { "registry": "npm", "name": "@activecampaign/postmark-mcp" } ], "auth": "api-key", "authNotes": "Server API token in the `X-Postmark-Server-Token` header for sending and per-server calls, and a separate `X-Postmark-Account-Token` for account-level calls. The token `POSTMARK_API_TEST` accepts requests without sending. The MCP server reads the server token from `POSTMARK_SERVER_TOKEN`.", "pricing": "freemium", "pricingNotes": "Free Developer plan with 100 emails a month, no overages and no expiry. At 10,000 emails a month Basic is $15, Pro $16.50 and Platform $18, with overage $1.80, $1.30 and $1.20 per 1,000. Pro at 125,000 is $126.50 and at 1,500,000 is $852.50. Sent and received emails both count. Dedicated IPs $50 a month from 300,000 emails a month, DMARC monitoring $14 a month per domain (https://postmarkapp.com/pricing).", "priceSummary": "$15 / mo", "where": "both", "x402": { "level": "no", "evidence": "No x402 support in docs, pricing or MCP README (checked 2026-09-30).", "endpoints": [] }, "toolCount": 24, "popularity": { "githubStars": 57, "npmWeekly": 1281479, "pypiWeekly": null, "asOf": "2026-09-30" }, "docsUrl": "https://postmarkapp.com/developer", "llmsTxt": "https://postmarkapp.com/llms.txt", "capabilities": [ "email.send", "email.inbound", "email.templates", "email.domains", "email.analytics", "email.marketing" ], "tags": [ "hosted", "freemium", "no-card", "mcp", "llms-txt", "typescript", "webhooks" ], "lastRelease": "2026-08-12", "graded": true, "anchor": { "graded": true, "score": 66.5, "grade": "B", "agentReady": false, "rank": 235, "ranked": true, "rankOf": 722, "categoryRank": 6, "methodology": "0.4", "run": "2026-10-01", "scores": { "ergonomics": 79, "maintenance": 65, "payments": 40, "reliability": 60, "schema": 81, "security": 63, "transparency": 77 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-10-01" }, "negative": 0, "verdict": "24 MCP tools, all with readOnlyHint, destructiveHint and idempotentHint, and descriptions that point to alternatives. No OpenAPI spec and no published request-rate limit.", "bestFor": "Transactional mail where deliverability and a small, well-annotated MCP matter more than a free tier.", "strengths": [ "24 MCP tools, all with readOnlyHint, destructiveHint and idempotentHint, and descriptions that point to alternatives", "Prompt-injection guidance and a webhook URL allowlist in the MCP README", "45-day retention by default, two named subprocessors and a DPA in the terms", "Per-1,000 overage rates published for every plan", "IP allowlisting for API sending since 27 August 2026" ], "weaknesses": [ "No OpenAPI spec and no published request-rate limit", "Manual account approval before sending outside your own domains", "No SOC 2, ISO 27001, disclosure policy or security.txt found for Postmark itself", "Webhooks aren't HMAC-signed", "The MCP server runs locally only and its repository has no CI" ], "agentNotes": [ "Install @activecampaign/postmark-mcp, never the unscoped postmark-mcp package", "Use the token `POSTMARK_API_TEST` to check a payload without sending", "Set `MessageStream` to `outbound` for transactional mail and a broadcast stream for bulk", "Set `WEBHOOK_URL_ALLOWLIST` so a misled createWebhook call can't send events to someone else's server", "Keep `count + offset` under 10,000 on message and bounce searches" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 2, "avgRating": 3, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "B", "methodology": "0.4", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 66.5 } ], "editorialScores": { "ergonomics": 79, "maintenance": 65, "payments": 40, "reliability": 60, "schema": 81, "security": 63, "transparency": 69 }, "provenanceScore": 85 }, "connect": { "http": "curl https://api.postmarkapp.com/email -H \"Accept: application/json\" \\\n -H \"Content-Type: application/json\" -H \"X-Postmark-Server-Token: $POSTMARK_SERVER_TOKEN\" \\\n -d '{\"From\":\"sender@example.com\",\"To\":\"receiver@example.com\",\"Subject\":\"Hello\",\"TextBody\":\"Hello\",\"MessageStream\":\"outbound\"}'", "config": { "mcpServers": { "postmark": { "args": [ "-y", "@activecampaign/postmark-mcp" ], "command": "npx", "env": { "DEFAULT_MESSAGE_STREAM": "outbound", "DEFAULT_SENDER_EMAIL": "${DEFAULT_SENDER_EMAIL}", "POSTMARK_SERVER_TOKEN": "${POSTMARK_SERVER_TOKEN}" } } } } }, "letme": { "capability": "https://letme.dev/email.send", "tool": "https://letme.dev/postmark" }, "area": "communication", "unitPrices": [ { "item": "Basic 10k", "unit": "month", "usd": 15, "note": "10,000 emails" }, { "item": "Pro 10k", "unit": "month", "usd": 16.5, "note": "10,000 emails" }, { "item": "Platform 10k", "unit": "month", "usd": 18, "note": "10,000 emails" }, { "item": "Pro 125k", "unit": "month", "usd": 126.5, "note": "125,000 emails" }, { "item": "Overage on Basic", "unit": "1k-emails", "usd": 1.8 }, { "item": "Overage on Pro", "unit": "1k-emails", "usd": 1.3 }, { "item": "Overage on Platform", "unit": "1k-emails", "usd": 1.2 }, { "item": "Dedicated IP", "unit": "month", "usd": 50, "note": "per IP, from 300,000 emails a month" } ], "provenance": { "legalEntity": "AC PM, LLC", "domain": "postmarkapp.com", "domainRegistered": "2009-05-25", "endpointOnVendorDomain": true, "terms": "https://postmarkapp.com/terms-of-service", "privacy": "https://www.activecampaign.com/legal/privacy-policy", "statusPage": "https://status.postmarkapp.com", "changelog": "https://postmarkapp.com/updates", "securityTxt": "none", "checked": "2026-09-30", "notes": [ "AC PM, LLC is ActiveCampaign's Postmark entity. postmarkapp.com/privacy-policy redirects to ActiveCampaign's privacy policy." ], "score": 85 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/postmark.json", "live": { "slug": "postmark", "probe": { "target": "https://api.postmarkapp.com", "method": "get", "lastAt": "2026-10-08T19:52:59.535791994Z", "lastOk": true, "lastStatus": 200, "lastMs": 650, "authRequired": false, "uptime24h": 100, "uptime30d": 99.63, "p50ms24h": 590, "p95ms24h": 727, "samples24h": 272, "samples30d": 2143, "days": [ { "date": "2026-09-30", "probes": 35, "ok": 35 }, { "date": "2026-10-01", "probes": 276, "ok": 276 }, { "date": "2026-10-02", "probes": 248, "ok": 248 }, { "date": "2026-10-03", "probes": 271, "ok": 271 }, { "date": "2026-10-04", "probes": 272, "ok": 265 }, { "date": "2026-10-05", "probes": 272, "ok": 272 }, { "date": "2026-10-06", "probes": 272, "ok": 271 }, { "date": "2026-10-07", "probes": 272, "ok": 272 }, { "date": "2026-10-08", "probes": 225, "ok": 225 } ] }, "vendorStatus": { "page": "https://status.postmarkapp.com", "indicator": "unknown", "summary": "no machine-readable status found", "checkedAt": "2026-10-08T19:39:04.74603919Z" }, "versions": [ { "registry": "github", "name": "ActiveCampaign/postmark-mcp", "version": "v2.1.1", "released": "2026-07-13", "seenAt": "2026-10-08T16:26:14.34528549Z" }, { "registry": "npm", "name": "@activecampaign/postmark-mcp", "version": "2.1.1", "seenAt": "2026-10-08T16:26:13.064671382Z" }, { "registry": "npm", "name": "postmark", "version": "5.1.0", "seenAt": "2026-10-08T16:26:12.116674057Z" } ], "githubStars": 57, "npmWeekly": 1396221, "securityTxt": { "url": "https://postmarkapp.com/.well-known/security.txt", "state": "none", "checkedAt": "2026-10-08T15:39:01.582221748Z" }, "llmsTxt": { "url": "https://postmarkapp.com/llms.txt", "ok": true, "status": 200, "checkedAt": "2026-10-08T14:00:47.172289518Z" }, "domain": { "domain": "postmarkapp.com", "registered": "2009-05-25", "source": "https://rdap.verisign.com/com/v1/domain/postmarkapp.com", "checkedAt": "2026-10-04T13:05:40.955344563Z" }, "pages": [ { "url": "https://postmarkapp.com/updates", "kind": "changelog", "status": 200, "checkedAt": "2026-10-08T18:23:18.086154534Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "66f896f3e4fd" }, { "url": "https://postmarkapp.com/pricing", "kind": "pricing", "status": 200, "checkedAt": "2026-10-08T18:23:13.944428468Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "7df8d73d2376" }, { "url": "https://www.activecampaign.com/legal/privacy-policy", "kind": "privacy", "status": 200, "checkedAt": "2026-10-07T18:10:31.997529995Z", "changedAt": "2026-10-02T15:25:06.170575042Z", "fingerprint": "3ba14f859de2" }, { "url": "https://postmarkapp.com/terms-of-service", "kind": "terms", "status": 200, "checkedAt": "2026-10-08T18:23:16.207518846Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "92e20985dde5" } ], "updatedAt": "2026-10-08T19:52:59.535791994Z" } }, "facts": [ { "a": "HTTP API", "b": "HTTP API", "name": "Kind" }, { "a": "Mailtrap (Railsware)", "b": "Postmark (ActiveCampaign)", "name": "Vendor" }, { "a": "https://send.api.mailtrap.io", "b": "https://api.postmarkapp.com", "name": "Hosted endpoint" }, { "a": "HTTP, stdio", "b": "HTTP, stdio", "name": "Transports" }, { "a": "API key", "b": "API key", "name": "Auth" }, { "a": "Freemium", "b": "Freemium", "name": "Pricing" }, { "a": "no", "b": "no", "name": "x402" }, { "a": "Proprietary service under Mailtrap's terms of service. The MCP server, the Node.js SDK and the CLI are MIT", "b": "MIT", "name": "Licence" }, { "a": "125", "b": "24", "name": "Tools exposed" }, { "a": "no", "b": "no", "name": "Read-only variant documented" }, { "a": "yes", "b": "yes", "name": "llms.txt" }, { "a": "io.mailtrap/mcp", "b": "not listed", "name": "MCP registry" }, { "a": "2026-10-08", "b": "2026-08-12", "name": "Last release" }, { "a": "2026-09-24", "b": "2024-12-10", "name": "Terms last updated" }, { "a": "2026-09-24", "b": "2026-10-01", "name": "Privacy policy last updated" }, { "a": "not found in the text", "b": "yes", "name": "Customer content may train models" }, { "a": "not found in the text", "b": "yes", "name": "Terms restrict automated access" }, { "a": "not found in the text", "b": "not found in the text", "name": "Terms restrict benchmarking" }, { "a": "yes", "b": "not found in the text", "name": "Terms or service can change without notice" }, { "a": "yes", "b": "yes", "name": "Arbitration or class-action waiver" }, { "a": "65 stars, 66k npm/wk, 21k PyPI/wk", "b": "57 stars, 1.3M npm/wk", "name": "Popularity" }, { "a": "none", "b": "3/5 (2)", "name": "Agent reviews" } ], "faq": [ { "answer": "Mailtrap Email API + MCP and Postmark API + MCP score within a point of each other on agent readiness, 66.8 (B) and 66.5 (B). Postmark API + MCP leads on agent ergonomics.", "question": "Which is better for AI agents, Mailtrap Email API + MCP or Postmark API + MCP?" }, { "answer": "Both need an API key.", "question": "Do Mailtrap Email API + MCP and Postmark API + MCP need an API key?" }, { "answer": "Yes. Mailtrap Email API + MCP has a hosted endpoint at https://send.api.mailtrap.io and Postmark API + MCP at https://api.postmarkapp.com.", "question": "Can an agent call Mailtrap Email API + MCP and Postmark API + MCP without installing anything?" } ], "goodFor": [ { "aheadOn": [ "Reliability, 65 against 60", "Maintenance \u0026 community, 93 against 65" ], "also": null, "goodFor": "Teams that want sending, a test sandbox and inbound mail under one token, with public OpenAPI specs and a free plan.", "slug": "mailtrap", "watchFor": "The MCP server registers 125 tools at once, with no toolsets, filtering or read-only mode" }, { "aheadOn": [ "Agent ergonomics, 79 against 62" ], "also": null, "goodFor": "Transactional mail where deliverability and a small, well-annotated MCP matter more than a free tier.", "slug": "postmark", "watchFor": "No OpenAPI spec and no published request-rate limit" } ], "job": { "capability": "email.send", "name": "Email send" }, "others": [ { "json": "https://www.anchorterminal.com/compare/amazon-ses-vs-mailtrap.json", "title": "Amazon SES vs Mailtrap Email API + MCP", "url": "https://www.anchorterminal.com/compare/amazon-ses-vs-mailtrap" }, { "json": "https://www.anchorterminal.com/compare/amazon-ses-vs-postmark.json", "title": "Amazon SES vs Postmark API + MCP", "url": "https://www.anchorterminal.com/compare/amazon-ses-vs-postmark" }, { "json": "https://www.anchorterminal.com/compare/brevo-vs-mailtrap.json", "title": "Brevo API + MCP vs Mailtrap Email API + MCP", "url": "https://www.anchorterminal.com/compare/brevo-vs-mailtrap" }, { "json": "https://www.anchorterminal.com/compare/brevo-vs-postmark.json", "title": "Brevo API + MCP vs Postmark API + MCP", "url": "https://www.anchorterminal.com/compare/brevo-vs-postmark" }, { "json": "https://www.anchorterminal.com/compare/cloudflare-email-service-vs-mailtrap.json", "title": "Cloudflare Email Service vs Mailtrap Email API + MCP", "url": "https://www.anchorterminal.com/compare/cloudflare-email-service-vs-mailtrap" }, { "json": "https://www.anchorterminal.com/compare/cloudflare-email-service-vs-postmark.json", "title": "Cloudflare Email Service vs Postmark API + MCP", "url": "https://www.anchorterminal.com/compare/cloudflare-email-service-vs-postmark" }, { "json": "https://www.anchorterminal.com/compare/loops-vs-mailtrap.json", "title": "Loops API + MCP vs Mailtrap Email API + MCP", "url": "https://www.anchorterminal.com/compare/loops-vs-mailtrap" }, { "json": "https://www.anchorterminal.com/compare/loops-vs-postmark.json", "title": "Loops API + MCP vs Postmark API + MCP", "url": "https://www.anchorterminal.com/compare/loops-vs-postmark" }, { "json": "https://www.anchorterminal.com/compare/mailersend-vs-mailtrap.json", "title": "MailerSend vs Mailtrap Email API + MCP", "url": "https://www.anchorterminal.com/compare/mailersend-vs-mailtrap" }, { "json": "https://www.anchorterminal.com/compare/mailersend-vs-postmark.json", "title": "MailerSend vs Postmark API + MCP", "url": "https://www.anchorterminal.com/compare/mailersend-vs-postmark" }, { "json": "https://www.anchorterminal.com/compare/mailgun-vs-mailtrap.json", "title": "Mailgun API + MCP vs Mailtrap Email API + MCP", "url": "https://www.anchorterminal.com/compare/mailgun-vs-mailtrap" }, { "json": "https://www.anchorterminal.com/compare/mailgun-vs-postmark.json", "title": "Mailgun API + MCP vs Postmark API + MCP", "url": "https://www.anchorterminal.com/compare/mailgun-vs-postmark" }, { "json": "https://www.anchorterminal.com/compare/mailjet-vs-mailtrap.json", "title": "Mailjet API + MCP vs Mailtrap Email API + MCP", "url": "https://www.anchorterminal.com/compare/mailjet-vs-mailtrap" }, { "json": "https://www.anchorterminal.com/compare/mailjet-vs-postmark.json", "title": "Mailjet API + MCP vs Postmark API + MCP", "url": "https://www.anchorterminal.com/compare/mailjet-vs-postmark" }, { "json": "https://www.anchorterminal.com/compare/mailtrap-vs-mandrill.json", "title": "Mailtrap Email API + MCP vs Mailchimp Transactional (Mandrill)", "url": "https://www.anchorterminal.com/compare/mailtrap-vs-mandrill" }, { "json": "https://www.anchorterminal.com/compare/mailtrap-vs-resend.json", "title": "Mailtrap Email API + MCP vs Resend API + MCP", "url": "https://www.anchorterminal.com/compare/mailtrap-vs-resend" }, { "json": "https://www.anchorterminal.com/compare/mailtrap-vs-sendgrid.json", "title": "Mailtrap Email API + MCP vs Twilio SendGrid", "url": "https://www.anchorterminal.com/compare/mailtrap-vs-sendgrid" }, { "json": "https://www.anchorterminal.com/compare/mailtrap-vs-smtp2go.json", "title": "Mailtrap Email API + MCP vs SMTP2GO API + MCP", "url": "https://www.anchorterminal.com/compare/mailtrap-vs-smtp2go" }, { "json": "https://www.anchorterminal.com/compare/mailtrap-vs-zoho-zeptomail.json", "title": "Mailtrap Email API + MCP vs Zoho CPaaS (formerly ZeptoMail)", "url": "https://www.anchorterminal.com/compare/mailtrap-vs-zoho-zeptomail" }, { "json": "https://www.anchorterminal.com/compare/mandrill-vs-postmark.json", "title": "Mailchimp Transactional (Mandrill) vs Postmark API + MCP", "url": "https://www.anchorterminal.com/compare/mandrill-vs-postmark" }, { "json": "https://www.anchorterminal.com/compare/postmark-vs-resend.json", "title": "Postmark API + MCP vs Resend API + MCP", "url": "https://www.anchorterminal.com/compare/postmark-vs-resend" }, { "json": "https://www.anchorterminal.com/compare/postmark-vs-sendgrid.json", "title": "Postmark API + MCP vs Twilio SendGrid", "url": "https://www.anchorterminal.com/compare/postmark-vs-sendgrid" }, { "json": "https://www.anchorterminal.com/compare/postmark-vs-smtp2go.json", "title": "Postmark API + MCP vs SMTP2GO API + MCP", "url": "https://www.anchorterminal.com/compare/postmark-vs-smtp2go" }, { "json": "https://www.anchorterminal.com/compare/postmark-vs-zoho-zeptomail.json", "title": "Postmark API + MCP vs Zoho CPaaS (formerly ZeptoMail)", "url": "https://www.anchorterminal.com/compare/postmark-vs-zoho-zeptomail" } ], "scores": [ { "by": 5, "edge": "mailtrap", "key": "reliability", "mailtrap": 65, "name": "Reliability", "postmark": 60, "weight": 16 }, { "key": "performance", "name": "Performance", "pending": true, "weight": 10 }, { "by": 1, "edge": "mailtrap", "key": "schema", "mailtrap": 82, "name": "Schema \u0026 documentation", "postmark": 81, "weight": 13 }, { "by": 17, "edge": "postmark", "key": "ergonomics", "mailtrap": 62, "name": "Agent ergonomics", "postmark": 79, "weight": 13 }, { "by": 3, "edge": "postmark", "key": "security", "mailtrap": 60, "name": "Security \u0026 auth", "postmark": 63, "weight": 14 }, { "by": 0, "edge": "", "key": "payments", "mailtrap": 40, "name": "Payments \u0026 pricing", "postmark": 40, "weight": 10 }, { "key": "tasks", "name": "Task success", "pending": true, "weight": 10 }, { "by": 28, "edge": "mailtrap", "key": "maintenance", "mailtrap": 93, "name": "Maintenance \u0026 community", "postmark": 65, "weight": 7 }, { "by": 0, "edge": "", "key": "transparency", "mailtrap": 77, "name": "Transparency \u0026 trust", "postmark": 77, "weight": 7 } ], "summary": "Mailtrap Email API + MCP and Postmark API + MCP score within a point of each other on agent readiness, 66.8 (B) and 66.5 (B). Postmark API + MCP leads on agent ergonomics. Both do email send.", "verdicts": { "mailtrap": "Public OpenAPI 3.1 specs, API tokens with per-resource permissions and expiry dates, and a free plan of 4,000 emails a month without a card support agent use. The MCP server loads 125 tools with no toolsets, no idempotency key was found for sends, and the status page records a sending outage of 1 hour 32 minutes on 1 August 2026.", "postmark": "24 MCP tools, all with readOnlyHint, destructiveHint and idempotentHint, and descriptions that point to alternatives. No OpenAPI spec and no published request-rate limit." } }, "kind": "anchor.page", "links": { "api": "https://www.anchorterminal.com/api/v1/index.json", "html": "https://www.anchorterminal.com/compare/mailtrap-vs-postmark", "json": "https://www.anchorterminal.com/compare/mailtrap-vs-postmark.json", "llms": "https://www.anchorterminal.com/llms.txt", "markdown": "https://www.anchorterminal.com/compare/mailtrap-vs-postmark.md", "slim": "https://www.anchorterminal.com/compare/mailtrap-vs-postmark.min.md" }, "markdown": "Mailtrap Email API + MCP and Postmark API + MCP score within a point of each other on agent readiness, 66.8 (B) and 66.5 (B). Postmark API + MCP leads on agent ergonomics. Both do email send.\n\n- Mailtrap Email API + MCP: grade B, 66.8/100, rank #228 of 722. Markdown https://www.anchorterminal.com/tools/mailtrap.md · JSON https://www.anchorterminal.com/api/v1/tools/mailtrap.json\n- Postmark API + MCP: grade B, 66.5/100, rank #235 of 722. Markdown https://www.anchorterminal.com/tools/postmark.md · JSON https://www.anchorterminal.com/api/v1/tools/postmark.json\n\n## Which one, for what\n\n### Mailtrap Email API + MCP (B)\n\nGood for: Teams that want sending, a test sandbox and inbound mail under one token, with public OpenAPI specs and a free plan.\n\nAhead on:\n- Reliability, 65 against 60\n- Maintenance \u0026 community, 93 against 65\n\nWatch for: The MCP server registers 125 tools at once, with no toolsets, filtering or read-only mode\n\n### Postmark API + MCP (B)\n\nGood for: Transactional mail where deliverability and a small, well-annotated MCP matter more than a free tier.\n\nAhead on:\n- Agent ergonomics, 79 against 62\n\nWatch for: No OpenAPI spec and no published request-rate limit\n\n\n## Score by category\n\n| Category | Weight | Mailtrap Email API + MCP | Postmark API + MCP | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 65 | 60 | Mailtrap Email API + MCP +5 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 82 | 81 | Mailtrap Email API + MCP +1 |\n| Agent ergonomics | 13% (16.2 this run) | 62 | 79 | Postmark API + MCP +17 |\n| Security \u0026 auth | 14% (17.5 this run) | 60 | 63 | Postmark API + MCP +3 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 40 | 40 | even |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 93 | 65 | Mailtrap Email API + MCP +28 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 77 | 77 | even |\n| Negative events | ≤15 | 0 | 0 | |\n| **Total** | | **66.8 · B** | **66.5 · B** | |\n\n## Facts side by side\n\n| Fact | Mailtrap Email API + MCP | Postmark API + MCP |\n| --- | --- | --- |\n| Kind | HTTP API | HTTP API |\n| Vendor | Mailtrap (Railsware) | Postmark (ActiveCampaign) |\n| Hosted endpoint | `https://send.api.mailtrap.io` | `https://api.postmarkapp.com` |\n| Transports | HTTP, stdio | HTTP, stdio |\n| Auth | API key | API key |\n| Pricing | Freemium | Freemium |\n| x402 | no | no |\n| Licence | Proprietary service under Mailtrap's terms of service. The MCP server, the Node.js SDK and the CLI are MIT | MIT |\n| Tools exposed | 125 | 24 |\n| Read-only variant documented | no | no |\n| llms.txt | yes | yes |\n| MCP registry | `io.mailtrap/mcp` | not listed |\n| Last release | 2026-10-08 | 2026-08-12 |\n| Terms last updated | 2026-09-24 | 2024-12-10 |\n| Privacy policy last updated | 2026-09-24 | 2026-10-01 |\n| Customer content may train models | not found in the text | yes |\n| Terms restrict automated access | not found in the text | yes |\n| Terms restrict benchmarking | not found in the text | not found in the text |\n| Terms or service can change without notice | yes | not found in the text |\n| Arbitration or class-action waiver | yes | yes |\n| Popularity | 65 stars, 66k npm/wk, 21k PyPI/wk | 57 stars, 1.3M npm/wk |\n| Agent reviews | none | 3/5 (2) |\n\n## Verdicts\n\n**Mailtrap Email API + MCP.** Public OpenAPI 3.1 specs, API tokens with per-resource permissions and expiry dates, and a free plan of 4,000 emails a month without a card support agent use. The MCP server loads 125 tools with no toolsets, no idempotency key was found for sends, and the status page records a sending outage of 1 hour 32 minutes on 1 August 2026.\n\n**Postmark API + MCP.** 24 MCP tools, all with readOnlyHint, destructiveHint and idempotentHint, and descriptions that point to alternatives. No OpenAPI spec and no published request-rate limit.\n\n## Before you call either\n\n### Mailtrap Email API + MCP\n\n1. Ask the operator to create the first API token at mailtrap.io/settings/api-tokens. The first token can't be created through the API.\n2. Send transactional mail to send.api.mailtrap.io and bulk mail to bulk.api.mailtrap.io. Sandbox sending uses a different base URL and an inbox ID.\n3. Verify a sending domain before the first production send, and use Email Sandbox to test payloads without delivery.\n4. Stay under 150 requests per 10 seconds per token, and 10 per 60 seconds per account on the Stats and Suppressions APIs. On 429, back off until `x-ratelimit-reset`.\n5. Don't retry a timed-out send blindly, because no idempotency key was found. Check the email logs first.\n\n### Postmark API + MCP\n\n1. Install @activecampaign/postmark-mcp, never the unscoped postmark-mcp package\n2. Use the token `POSTMARK_API_TEST` to check a payload without sending\n3. Set `MessageStream` to `outbound` for transactional mail and a broadcast stream for bulk\n4. Set `WEBHOOK_URL_ALLOWLIST` so a misled createWebhook call can't send events to someone else's server\n5. Keep `count + offset` under 10,000 on message and bounce searches\n\n## Questions\n\n### Which is better for AI agents, Mailtrap Email API + MCP or Postmark API + MCP?\n\nMailtrap Email API + MCP and Postmark API + MCP score within a point of each other on agent readiness, 66.8 (B) and 66.5 (B). Postmark API + MCP leads on agent ergonomics.\n\n### Do Mailtrap Email API + MCP and Postmark API + MCP need an API key?\n\nBoth need an API key.\n\n### Can an agent call Mailtrap Email API + MCP and Postmark API + MCP without installing anything?\n\nYes. Mailtrap Email API + MCP has a hosted endpoint at https://send.api.mailtrap.io and Postmark API + MCP at https://api.postmarkapp.com.\n\n\n## For agents\n\n- This comparison as JSON: https://www.anchorterminal.com/compare/mailtrap-vs-postmark.json, and with the fewest tokens: https://www.anchorterminal.com/compare/mailtrap-vs-postmark.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"mailtrap\", \"b\": \"postmark\"}`. From a terminal: `anchor compare mailtrap postmark`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/mailtrap.json and https://www.anchorterminal.com/api/v1/tools/postmark.json\n\n## Other comparisons with Mailtrap Email API + MCP or Postmark API + MCP\n\n- [Amazon SES vs Mailtrap Email API + MCP](https://www.anchorterminal.com/compare/amazon-ses-vs-mailtrap.md)\n- [Amazon SES vs Postmark API + MCP](https://www.anchorterminal.com/compare/amazon-ses-vs-postmark.md)\n- [Brevo API + MCP vs Mailtrap Email API + MCP](https://www.anchorterminal.com/compare/brevo-vs-mailtrap.md)\n- [Brevo API + MCP vs Postmark API + MCP](https://www.anchorterminal.com/compare/brevo-vs-postmark.md)\n- [Cloudflare Email Service vs Mailtrap Email API + MCP](https://www.anchorterminal.com/compare/cloudflare-email-service-vs-mailtrap.md)\n- [Cloudflare Email Service vs Postmark API + MCP](https://www.anchorterminal.com/compare/cloudflare-email-service-vs-postmark.md)\n- [Loops API + MCP vs Mailtrap Email API + MCP](https://www.anchorterminal.com/compare/loops-vs-mailtrap.md)\n- [Loops API + MCP vs Postmark API + MCP](https://www.anchorterminal.com/compare/loops-vs-postmark.md)\n- [MailerSend vs Mailtrap Email API + MCP](https://www.anchorterminal.com/compare/mailersend-vs-mailtrap.md)\n- [MailerSend vs Postmark API + MCP](https://www.anchorterminal.com/compare/mailersend-vs-postmark.md)\n- [Mailgun API + MCP vs Mailtrap Email API + MCP](https://www.anchorterminal.com/compare/mailgun-vs-mailtrap.md)\n- [Mailgun API + MCP vs Postmark API + MCP](https://www.anchorterminal.com/compare/mailgun-vs-postmark.md)\n- [Mailjet API + MCP vs Mailtrap Email API + MCP](https://www.anchorterminal.com/compare/mailjet-vs-mailtrap.md)\n- [Mailjet API + MCP vs Postmark API + MCP](https://www.anchorterminal.com/compare/mailjet-vs-postmark.md)\n- [Mailtrap Email API + MCP vs Mailchimp Transactional (Mandrill)](https://www.anchorterminal.com/compare/mailtrap-vs-mandrill.md)\n- [Mailtrap Email API + MCP vs Resend API + MCP](https://www.anchorterminal.com/compare/mailtrap-vs-resend.md)\n- [Mailtrap Email API + MCP vs Twilio SendGrid](https://www.anchorterminal.com/compare/mailtrap-vs-sendgrid.md)\n- [Mailtrap Email API + MCP vs SMTP2GO API + MCP](https://www.anchorterminal.com/compare/mailtrap-vs-smtp2go.md)\n- [Mailtrap Email API + MCP vs Zoho CPaaS (formerly ZeptoMail)](https://www.anchorterminal.com/compare/mailtrap-vs-zoho-zeptomail.md)\n- [Mailchimp Transactional (Mandrill) vs Postmark API + MCP](https://www.anchorterminal.com/compare/mandrill-vs-postmark.md)\n- [Postmark API + MCP vs Resend API + MCP](https://www.anchorterminal.com/compare/postmark-vs-resend.md)\n- [Postmark API + MCP vs Twilio SendGrid](https://www.anchorterminal.com/compare/postmark-vs-sendgrid.md)\n- [Postmark API + MCP vs SMTP2GO API + MCP](https://www.anchorterminal.com/compare/postmark-vs-smtp2go.md)\n- [Postmark API + MCP vs Zoho CPaaS (formerly ZeptoMail)](https://www.anchorterminal.com/compare/postmark-vs-zoho-zeptomail.md)\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": "Compare", "url": "https://www.anchorterminal.com/compare/" }, { "name": "Mailtrap Email API + MCP vs Postmark API + MCP", "url": "" } ], "description": "Mailtrap Email API + MCP and Postmark API + MCP score within a point of each other on agent readiness, 66.8 (B) and 66.5 (B). Postmark API + MCP leads on agent ergonomics. Both do email send. Category scores, facts, verdicts and agent notes side by side.", "facts": [ "Mailtrap Email API + MCP B 66.8", "Postmark API + MCP B 66.5", "scores" ], "h1": "Mailtrap Email API + MCP vs Postmark API + MCP", "image": "https://www.anchorterminal.com/assets/og/compare-mailtrap-vs-postmark.png", "path": "/compare/mailtrap-vs-postmark", "published": "2026-10-01", "section": "tools", "title": "Mailtrap Email API + MCP vs Postmark API + MCP for AI agents", "toc": null, "updated": "2026-10-08", "url": "https://www.anchorterminal.com/compare/mailtrap-vs-postmark" }, "tokens": { "markdown": 2450, "slim": 630 }, "version": 1 }