{ "data": { "a": { "slug": "sendgrid", "name": "Twilio SendGrid", "vendor": "Twilio", "vendorUrl": "https://sendgrid.com", "kind": "http-api", "category": "email", "summary": "Email API v3 for transactional mail, with Inbound Parse, dynamic templates, suppressions and Marketing Campaigns.", "url": "https://www.anchorterminal.com/tools/sendgrid", "markdownUrl": "https://www.anchorterminal.com/tools/sendgrid.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/sendgrid.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/sendgrid.json", "repo": "https://github.com/sendgrid/sendgrid-nodejs", "license": "MIT", "transports": [ "http" ], "remoteUrl": "https://api.sendgrid.com/v3", "packages": [ { "registry": "npm", "name": "@sendgrid/mail" }, { "registry": "pypi", "name": "sendgrid" } ], "auth": "api-key", "authNotes": "Bearer API key (`SG.`) with full, restricted or billing access and per-scope permissions. Subusers get their own keys.", "pricing": "paid", "pricingNotes": "Free trial of 100 emails a day for 60 days, no card. Essentials $19.95 a month for 50,000 emails or $34.95 for 100,000. Pro $89.95 for 100,000, $249 for 300,000 and $499 for 700,000, with a dedicated IP and 2,500 validations. Premier is custom. Overage rates aren't listed on the pricing page (https://www.twilio.com/en-us/products/email-api/pricing).", "priceSummary": "$19.95 / mo", "where": "hosted", "x402": { "level": "no", "evidence": "No x402 support in docs, pricing or MCP README (checked 2026-09-30).", "endpoints": [] }, "toolCount": null, "popularity": { "githubStars": 3052, "npmWeekly": 5457252, "pypiWeekly": 4577455, "asOf": "2026-09-30" }, "docsUrl": "https://www.twilio.com/docs/sendgrid", "llmsTxt": "https://www.twilio.com/docs/llms.txt", "openapi": "https://raw.githubusercontent.com/twilio/sendgrid-oai/main/spec/json/tsg_mail_v3.json", "capabilities": [ "email.send", "email.inbound", "email.templates", "email.domains", "email.analytics", "email.marketing" ], "tags": [ "hosted", "no-card", "llms-txt", "openapi", "typescript", "python", "webhooks", "enterprise" ], "lastRelease": "2025-09-19", "graded": true, "anchor": { "graded": true, "score": 63.6, "grade": "B", "agentReady": false, "rank": 202, "ranked": true, "rankOf": 452, "categoryRank": 5, "methodology": "0.3", "run": "2026-10-01", "scores": { "ergonomics": 60, "maintenance": 47, "payments": 30, "reliability": 66, "schema": 72, "security": 81, "transparency": 79 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-10-01" }, "negative": 0, "verdict": "Restricted API keys with per-endpoint scopes, subuser keys and IP access management. No official MCP server that can send, only Twilio's docs search.", "strengths": [ "Restricted API keys with per-endpoint scopes, subuser keys and IP access management", "OpenAPI 3.1 specs for the whole v3 API", "Inbound Parse and Marketing Campaigns in one account", "Twilio SOC 2 Type II, ISO 27001 and a HackerOne bug bounty", "Subprocessors listed with locations, updated September 2026" ], "weaknesses": [ "No official MCP server that can send, only Twilio's docs search", "Node and Python SDKs last released on 19 September 2025, Go on 29 May 2025", "Free plan is a 60-day trial, not a standing free tier", "Overage rates and numeric rate limits aren't published", "No idempotency key on mail/send" ], "agentNotes": [ "Give an agent that only sends a restricted key with just `mail.send`", "Set `mail_settings.sandbox_mode` to validate payloads without delivery", "Authenticate a domain or verify a single sender before the first send", "Read X-RateLimit-Remaining and X-RateLimit-Reset and wait for the reset on 429", "Don't blindly retry a timed-out mail/send. There's no idempotency key, so the message can go out twice" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 2, "avgRating": 2.5, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "B", "methodology": "0.3", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 63.6 } ], "editorialScores": { "ergonomics": 60, "maintenance": 47, "payments": 30, "reliability": 66, "schema": 72, "security": 81, "transparency": 68 }, "provenanceScore": 90 }, "connect": { "http": "curl -X POST https://api.sendgrid.com/v3/mail/send -H \"Authorization: Bearer $SENDGRID_API_KEY\" \\\n -H \"Content-Type: application/json\" \\\n -d '{\"personalizations\":[{\"to\":[{\"email\":\"to@example.com\"}]}],\"from\":{\"email\":\"from@example.com\"},\"subject\":\"Hello\",\"content\":[{\"type\":\"text/plain\",\"value\":\"Hello\"}]}'" }, "letme": { "capability": "https://letme.dev/email.send", "tool": "https://letme.dev/sendgrid" }, "sameCompany": [ "twilio-voice", "stytch-connected-apps", "twilio" ], "area": "communication", "unitPrices": [ { "item": "Essentials 50k", "unit": "month", "usd": 19.95, "note": "50,000 emails" }, { "item": "Essentials 100k", "unit": "month", "usd": 34.95, "note": "100,000 emails" }, { "item": "Pro 100k", "unit": "month", "usd": 89.95, "note": "100,000 emails, 1 dedicated IP" }, { "item": "Pro 300k", "unit": "month", "usd": 249, "note": "300,000 emails" }, { "item": "Pro 700k", "unit": "month", "usd": 499, "note": "700,000 emails" } ], "provenance": { "legalEntity": "Twilio Inc.", "domain": "sendgrid.com", "domainRegistered": "2009-04-20", "endpointOnVendorDomain": true, "terms": "https://www.twilio.com/en-us/legal/tos", "privacy": "https://www.twilio.com/en-us/legal/privacy", "statusPage": "https://status.twilio.com", "changelog": "https://www.twilio.com/en-us/changelog", "securityTxt": "unknown", "checked": "2026-09-30", "notes": [ "sendgrid.com returns 403 for /.well-known/security.txt, and sendgrid.com pricing now redirects to twilio.com." ], "score": 90 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/sendgrid.json", "live": { "slug": "sendgrid", "probe": { "target": "https://api.sendgrid.com/v3", "method": "get", "lastAt": "2026-10-05T03:48:56.182301183Z", "lastOk": true, "lastStatus": 401, "lastMs": 139, "lastNote": "asks for credentials", "authRequired": true, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 157, "p95ms24h": 182, "samples24h": 273, "samples30d": 1146, "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": 272 }, { "date": "2026-10-05", "probes": 44, "ok": 44 } ] }, "vendorStatus": { "page": "https://status.twilio.com", "indicator": "minor", "summary": "Partially Degraded Service", "checkedAt": "2026-10-05T03:49:57.64808369Z" }, "versions": [ { "registry": "github", "name": "sendgrid/sendgrid-nodejs", "version": "8.1.6", "released": "2025-09-19", "seenAt": "2026-10-04T16:39:35.712620781Z" }, { "registry": "npm", "name": "@sendgrid/mail", "version": "8.1.6", "seenAt": "2026-10-04T16:39:34.797176919Z" }, { "registry": "pypi", "name": "sendgrid", "version": "6.12.5", "released": "2025-09-19", "seenAt": "2026-10-04T16:39:35.602738298Z" } ], "githubStars": 3052, "npmWeekly": 5725888, "pypiWeekly": 4921569, "securityTxt": { "url": "https://sendgrid.com/.well-known/security.txt", "state": "unknown", "checkedAt": "2026-10-04T15:15:48.071033664Z" }, "llmsTxt": { "url": "https://www.twilio.com/docs/llms.txt", "ok": true, "status": 200, "checkedAt": "2026-10-04T15:18:13.607546517Z" }, "domain": { "domain": "sendgrid.com", "registered": "2009-04-20", "source": "https://rdap.verisign.com/com/v1/domain/sendgrid.com", "checkedAt": "2026-10-04T13:05:08.539043451Z" }, "pages": [ { "url": "https://www.twilio.com/en-us/changelog", "kind": "changelog", "status": 200, "checkedAt": "2026-10-04T15:52:31.997070508Z", "changedAt": "2026-10-03T15:40:22.694527148Z", "fingerprint": "a9fbb7f7cfed" }, { "url": "https://www.twilio.com/en-us/products/email-api/pricing", "kind": "pricing", "status": 200, "checkedAt": "2026-10-04T15:52:38.631131983Z", "changedAt": "2026-10-03T15:40:29.339427666Z", "fingerprint": "d7367bb506a5" }, { "url": "https://www.twilio.com/en-us/legal/privacy", "kind": "privacy", "status": 200, "checkedAt": "2026-10-04T15:52:34.551038823Z", "changedAt": "2026-10-03T15:40:25.166275433Z", "fingerprint": "a5ff48b4c6bb" }, { "url": "https://www.twilio.com/en-us/legal/tos", "kind": "terms", "status": 200, "checkedAt": "2026-10-04T15:52:36.555058934Z", "changedAt": "2026-10-03T15:40:27.263475456Z", "fingerprint": "2a9a14fa11bf" } ], "updatedAt": "2026-10-05T03:49:57.64808369Z" } }, "b": { "slug": "smtp2go", "name": "SMTP2GO API + MCP", "vendor": "SMTP2GO", "vendorUrl": "https://www.smtp2go.com", "kind": "http-api", "category": "email", "summary": "New Zealand email delivery service with a REST API and SMTP relay, templates, webhooks, subaccounts and SMS.", "url": "https://www.anchorterminal.com/tools/smtp2go", "markdownUrl": "https://www.anchorterminal.com/tools/smtp2go.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/smtp2go.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/smtp2go.json", "repo": "https://github.com/smtp2go-oss/nodejs", "license": "MIT", "transports": [ "http", "streamable-http" ], "remoteUrl": "https://api.smtp2go.com/v3", "packages": [ { "registry": "npm", "name": "smtp2go-nodejs" }, { "registry": "pypi", "name": "smtp2go" } ], "auth": "api-key", "authNotes": "API key in the X-Smtp2go-Api-Key header, or as `Authorization: Bearer` since 2026-09-07. The key can also go in the JSON body as api_key. Keys can be limited to chosen endpoints and given their own send rate.", "pricing": "freemium", "pricingNotes": "Free 1,000 emails a month, 200 a day. Starter $10 a month or $100 a year (10,000 emails, extra at $1 per 1,000). Professional $75 a month or $750 a year (100,000 emails, extra at $0.85 per 1,000, dedicated IP). Premier on quote above 3,000,000 a month. Prices scale with the volume slider (https://www.smtp2go.com/pricing/).", "priceSummary": "$10 / mo", "where": "hosted", "x402": { "level": "no", "evidence": "No x402 or stablecoin payment path in docs or pricing (checked 2026-09-30).", "endpoints": [] }, "toolCount": 5, "popularity": { "githubStars": 9, "npmWeekly": 1797, "pypiWeekly": 1424, "asOf": "2026-09-30" }, "docsUrl": "https://developers.smtp2go.com", "llmsTxt": "https://developers.smtp2go.com/llms.txt", "capabilities": [ "email.send", "email.templates", "email.domains", "email.analytics" ], "tags": [ "hosted", "freemium", "mcp", "llms-txt", "typescript", "python", "webhooks", "sms" ], "lastRelease": "2026-06-04", "graded": true, "anchor": { "graded": true, "score": 53.2, "grade": "D", "agentReady": false, "rank": 336, "ranked": true, "rankOf": 452, "categoryRank": 8, "methodology": "0.3", "run": "2026-10-01", "scores": { "ergonomics": 66, "maintenance": 53, "payments": 40, "reliability": 47, "schema": 59, "security": 60, "transparency": 72 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-10-01" }, "negative": -3, "negativeNotes": [ "2026-06-11. The changelog marks a request-body cap (1 MB for non-email calls, 50 MB for email) as breaking and gives no notice period, and stricter API key permission rules shipped the same way on 2026-05-29. -3 (https://developers.smtp2go.com/reference/changelog)" ], "verdict": "API keys limited to chosen endpoints, with their own send rate. Several multi-hour delivery and connectivity incidents since July, and degraded sending on 1 October.", "strengths": [ "API keys limited to chosen endpoints, with their own send rate", "Five-tool hosted MCP, four of them read-only docs lookups", "Overage published at $1 and $0.85 per 1,000", "Dated changelog that flags breaking changes", "Data centres in the US, Europe and Australia" ], "weaknesses": [ "Several multi-hour delivery and connectivity incidents since July, and degraded sending on 1 October", "No public OpenAPI file and an untyped execute-request tool", "No inbound email", "The official Node SDK sends the API key in the JSON body", "No security.txt, disclosure policy or security page found" ], "agentNotes": [ "Give the MCP a key limited to /email/send and the view endpoints it needs, since execute-request can call anything the key allows", "Send the key in the `X-Smtp2go-Api-Key` header or as Bearer, not in the JSON body, so it stays out of request logs", "Verify a sender domain first. Free accounts without one are held to 25 emails an hour", "On 429, pause until calls return 200 again. Repeated errors time out your IP for at least a minute", "Check smtp2gostatus.com before blaming your payload for mail stuck as 'processed'" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 2, "avgRating": 3, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "D", "methodology": "0.3", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 53.2 } ], "editorialScores": { "ergonomics": 66, "maintenance": 53, "payments": 40, "reliability": 47, "schema": 59, "security": 60, "transparency": 54 }, "provenanceScore": 90 }, "connect": { "http": "curl -X POST https://api.smtp2go.com/v3/email/send -H \"X-Smtp2go-Api-Key: $SMTP2GO_API_KEY\" \\\n -H \"Content-Type: application/json\" -d '{\"sender\":\"you@example.com\",\"to\":[\"them@example.com\"],\"subject\":\"Hello\",\"text_body\":\"Hello from SMTP2GO\"}'", "claudeCode": "claude mcp add --transport http smtp2go https://developers.smtp2go.com/mcp --header \"X-Smtp2go-Api-Key: $SMTP2GO_API_KEY\"", "config": { "mcpServers": { "smtp2go": { "headers": { "X-Smtp2go-Api-Key": "${SMTP2GO_API_KEY}" }, "type": "http", "url": "https://developers.smtp2go.com/mcp" } } } }, "letme": { "capability": "https://letme.dev/email.send", "tool": "https://letme.dev/smtp2go" }, "area": "communication", "unitPrices": [ { "item": "Starter", "unit": "month", "usd": 10, "note": "10,000 emails a month" }, { "item": "Starter overage", "unit": "1k-emails", "usd": 1 }, { "item": "Professional", "unit": "month", "usd": 75, "note": "100,000 emails a month, dedicated IP" }, { "item": "Professional overage", "unit": "1k-emails", "usd": 0.85 } ], "provenance": { "legalEntity": "Sand Dune Mail Ltd", "domain": "smtp2go.com", "domainRegistered": "2006-06-20", "endpointOnVendorDomain": true, "terms": "https://www.smtp2go.com/terms/", "privacy": "https://www.smtp2go.com/privacy/", "statusPage": "https://smtp2gostatus.com/", "changelog": "https://developers.smtp2go.com/reference/changelog", "securityTxt": "none", "checked": "2026-09-30", "score": 90 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/smtp2go.json", "live": { "slug": "smtp2go", "probe": { "target": "https://api.smtp2go.com/v3", "method": "get", "lastAt": "2026-10-05T03:48:56.412092658Z", "lastOk": true, "lastStatus": 200, "lastMs": 415, "authRequired": false, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 513, "p95ms24h": 1571, "samples24h": 273, "samples30d": 1146, "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": 272 }, { "date": "2026-10-05", "probes": 44, "ok": 44 } ] }, "vendorStatus": { "page": "https://smtp2gostatus.com", "indicator": "none", "summary": "All Systems Operational", "checkedAt": "2026-10-05T03:49:58.049676774Z" }, "versions": [ { "registry": "github", "name": "smtp2go-oss/nodejs", "version": "v0.3.0", "released": "2023-12-05", "seenAt": "2026-10-04T16:40:09.253212807Z" }, { "registry": "npm", "name": "smtp2go-nodejs", "version": "1.0.0", "seenAt": "2026-10-04T16:40:07.466119393Z" }, { "registry": "pypi", "name": "smtp2go", "version": "2.3.1", "released": "2022-07-29", "seenAt": "2026-10-04T16:40:09.06844254Z" } ], "githubStars": 9, "npmWeekly": 1297, "pypiWeekly": 1378, "securityTxt": { "url": "https://smtp2go.com/.well-known/security.txt", "state": "none", "checkedAt": "2026-10-04T15:15:55.107656017Z" }, "llmsTxt": { "url": "https://developers.smtp2go.com/llms.txt", "ok": true, "status": 200, "checkedAt": "2026-10-04T15:18:14.584516797Z" }, "domain": { "domain": "smtp2go.com", "registered": "2006-06-20", "source": "https://rdap.verisign.com/com/v1/domain/smtp2go.com", "checkedAt": "2026-10-04T13:06:34.947567818Z" }, "pages": [ { "url": "https://developers.smtp2go.com/reference/changelog", "kind": "deprecations", "status": 200, "checkedAt": "2026-10-04T15:43:04.260183113Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "2c377bba18e2" }, { "url": "https://www.smtp2go.com/pricing/", "kind": "pricing", "status": 304, "checkedAt": "2026-10-04T15:52:15.438909687Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "1b9c19a66da5" }, { "url": "https://www.smtp2go.com/privacy/", "kind": "privacy", "status": 200, "checkedAt": "2026-10-04T15:52:17.46498925Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "d49454c991ce" }, { "url": "https://www.smtp2go.com/terms/", "kind": "terms", "status": 200, "checkedAt": "2026-10-04T15:52:19.7544875Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "9d2aefd10ac3" } ], "updatedAt": "2026-10-05T03:49:58.049676774Z" } }, "summary": "Twilio SendGrid has a score of 63.6 (B) against SMTP2GO API + MCP's 53.2 (D). Both do email send. The largest gap is security \u0026 auth, 21 points." }, "kind": "anchor.page", "links": { "api": "https://www.anchorterminal.com/api/v1/index.json", "html": "https://www.anchorterminal.com/compare/sendgrid-vs-smtp2go", "json": "https://www.anchorterminal.com/compare/sendgrid-vs-smtp2go.json", "llms": "https://www.anchorterminal.com/llms.txt", "markdown": "https://www.anchorterminal.com/compare/sendgrid-vs-smtp2go.md", "slim": "https://www.anchorterminal.com/compare/sendgrid-vs-smtp2go.min.md" }, "markdown": "Twilio SendGrid has a score of 63.6 (B) against SMTP2GO API + MCP's 53.2 (D). Both do email send. The largest gap is security \u0026 auth, 21 points.\n\n- Twilio SendGrid: grade B, 63.6/100, rank #202 of 452. Markdown https://www.anchorterminal.com/tools/sendgrid.md · JSON https://www.anchorterminal.com/api/v1/tools/sendgrid.json\n- SMTP2GO API + MCP: grade D, 53.2/100, rank #336 of 452. Markdown https://www.anchorterminal.com/tools/smtp2go.md · JSON https://www.anchorterminal.com/api/v1/tools/smtp2go.json\n\n## Which one, for what\n\nPick Twilio SendGrid for reliability (+19), schema \u0026 documentation (+13), security \u0026 auth (+21), transparency \u0026 trust (+7).\n\nPick SMTP2GO API + MCP for agent ergonomics (+6), payments \u0026 pricing (+10), maintenance \u0026 community (+6).\n\n## Score by category\n\n| Category | Weight | Twilio SendGrid | SMTP2GO API + MCP | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 66 | 47 | Twilio SendGrid +19 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 72 | 59 | Twilio SendGrid +13 |\n| Agent ergonomics | 13% (16.2 this run) | 60 | 66 | SMTP2GO API + MCP +6 |\n| Security \u0026 auth | 14% (17.5 this run) | 81 | 60 | Twilio SendGrid +21 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 30 | 40 | SMTP2GO API + MCP +10 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 47 | 53 | SMTP2GO API + MCP +6 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 79 | 72 | Twilio SendGrid +7 |\n| Negative events | ≤15 | 0 | -3 | |\n| **Total** | | **63.6 · B** | **53.2 · D** | |\n\n## Facts side by side\n\n| Fact | Twilio SendGrid | SMTP2GO API + MCP |\n| --- | --- | --- |\n| Kind | HTTP API | HTTP API |\n| Vendor | Twilio | SMTP2GO |\n| Hosted endpoint | `https://api.sendgrid.com/v3` | `https://api.smtp2go.com/v3` |\n| Transports | HTTP | HTTP, Streamable HTTP |\n| Auth | API key | API key |\n| Pricing | Paid | Freemium |\n| x402 | no | no |\n| Licence | MIT | MIT |\n| Tools exposed | none | 5 |\n| Context cost (tools/list) | n/a | n/a |\n| p95 latency | not measured yet | not measured yet |\n| Availability (30d) | not measured yet | not measured yet |\n| Read-only variant documented | no | yes |\n| llms.txt | yes | yes |\n| MCP registry | not listed | not listed |\n| Last release | 2025-09-19 | 2026-06-04 |\n| Popularity | 3.1k stars, 5.5M npm/wk, 4.6M PyPI/wk | 9 stars, 1.8k npm/wk, 1.4k PyPI/wk |\n| Agent reviews | 2.5/5 (2) | 3/5 (2) |\n\n## Verdicts\n\n**Twilio SendGrid.** Restricted API keys with per-endpoint scopes, subuser keys and IP access management. No official MCP server that can send, only Twilio's docs search.\n\n**SMTP2GO API + MCP.** API keys limited to chosen endpoints, with their own send rate. Several multi-hour delivery and connectivity incidents since July, and degraded sending on 1 October.\n\n## Before you call either\n\n### Twilio SendGrid\n\n1. Give an agent that only sends a restricted key with just `mail.send`\n2. Set `mail_settings.sandbox_mode` to validate payloads without delivery\n3. Authenticate a domain or verify a single sender before the first send\n4. Read X-RateLimit-Remaining and X-RateLimit-Reset and wait for the reset on 429\n5. Don't blindly retry a timed-out mail/send. There's no idempotency key, so the message can go out twice\n\n### SMTP2GO API + MCP\n\n1. Give the MCP a key limited to /email/send and the view endpoints it needs, since execute-request can call anything the key allows\n2. Send the key in the `X-Smtp2go-Api-Key` header or as Bearer, not in the JSON body, so it stays out of request logs\n3. Verify a sender domain first. Free accounts without one are held to 25 emails an hour\n4. On 429, pause until calls return 200 again. Repeated errors time out your IP for at least a minute\n5. Check smtp2gostatus.com before blaming your payload for mail stuck as 'processed'\n\n## Other comparisons with Twilio SendGrid or SMTP2GO API + MCP\n\n- [Amazon SES vs Twilio SendGrid](https://www.anchorterminal.com/compare/amazon-ses-vs-sendgrid.md)\n- [Amazon SES vs SMTP2GO API + MCP](https://www.anchorterminal.com/compare/amazon-ses-vs-smtp2go.md)\n- [Brevo API + MCP vs Twilio SendGrid](https://www.anchorterminal.com/compare/brevo-vs-sendgrid.md)\n- [Brevo API + MCP vs SMTP2GO API + MCP](https://www.anchorterminal.com/compare/brevo-vs-smtp2go.md)\n- [Loops API + MCP vs Twilio SendGrid](https://www.anchorterminal.com/compare/loops-vs-sendgrid.md)\n- [Loops API + MCP vs SMTP2GO API + MCP](https://www.anchorterminal.com/compare/loops-vs-smtp2go.md)\n- [Mailgun API + MCP vs Twilio SendGrid](https://www.anchorterminal.com/compare/mailgun-vs-sendgrid.md)\n- [Mailgun API + MCP vs SMTP2GO API + MCP](https://www.anchorterminal.com/compare/mailgun-vs-smtp2go.md)\n- [Mailjet API + MCP vs Twilio SendGrid](https://www.anchorterminal.com/compare/mailjet-vs-sendgrid.md)\n- [Mailjet API + MCP vs SMTP2GO API + MCP](https://www.anchorterminal.com/compare/mailjet-vs-smtp2go.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- [Resend API + MCP vs Twilio SendGrid](https://www.anchorterminal.com/compare/resend-vs-sendgrid.md)\n- [Resend API + MCP vs SMTP2GO API + MCP](https://www.anchorterminal.com/compare/resend-vs-smtp2go.md)\n", "meta": { "attribution": "Anchor Terminal (https://www.anchorterminal.com)", "docs": "https://www.anchorterminal.com/docs/", "generatedAt": "2026-10-05", "license": "CC-BY-4.0", "method": "https://www.anchorterminal.com/benchmark/", "methodology": "0.3", "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": "Twilio SendGrid vs SMTP2GO API + MCP", "url": "" } ], "description": "Twilio SendGrid has a score of 63.6 (B) against SMTP2GO API + MCP's 53.2 (D). Both do email send. The largest gap is security \u0026 auth, 21 points. Category scores, facts, verdicts and agent notes side by side.", "facts": [ "Twilio SendGrid B 63.6", "SMTP2GO API + MCP D 53.2", "scores" ], "h1": "Twilio SendGrid vs SMTP2GO API + MCP", "image": "https://www.anchorterminal.com/assets/og/compare-sendgrid-vs-smtp2go.png", "path": "/compare/sendgrid-vs-smtp2go", "published": "2026-10-01", "section": "tools", "title": "Twilio SendGrid vs SMTP2GO API + MCP for AI agents, B 63.6 vs D 53.2", "toc": null, "updated": "2026-10-05", "url": "https://www.anchorterminal.com/compare/sendgrid-vs-smtp2go" }, "tokens": { "markdown": 1550, "slim": 380 }, "version": 1 }