{ "data": { "a": { "slug": "mailgun", "name": "Mailgun API + MCP", "vendor": "Mailgun (Sinch)", "vendorUrl": "https://www.mailgun.com", "kind": "http-api", "category": "email", "summary": "Email sending API with inbound routes, a Forwards API, templates, mailing lists, suppressions and address validation, in US and EU regions.", "url": "https://www.anchorterminal.com/tools/mailgun", "markdownUrl": "https://www.anchorterminal.com/tools/mailgun.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/mailgun.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/mailgun.json", "repo": "https://github.com/mailgun/mailgun-mcp-server", "license": "Apache-2.0", "transports": [ "http", "stdio" ], "remoteUrl": "https://api.mailgun.net/v3", "packages": [ { "registry": "npm", "name": "mailgun.js" }, { "registry": "pypi", "name": "mailgun" }, { "registry": "npm", "name": "@mailgun/mcp-server" } ], "auth": "api-key", "authNotes": "HTTP Basic auth with the username `api` and the API key as password. Role-based keys limit what each key can do. EU accounts use api.eu.mailgun.net. The MCP server reads `MAILGUN_API_KEY` and `MAILGUN_API_REGION` from its environment.", "pricing": "freemium", "pricingNotes": "Free plan with 100 emails a day, 1 custom domain, 1 inbound route and 1 day of logs. Basic $15 a month for 10,000 emails, overage $1.80 per 1,000. Foundation $35 for 50,000 (overage $1.30, first month free). Scale $90 for 100,000 (overage $1.10 falling to $0.40 at 2.5 million), with a dedicated IP and 5,000 validations. Validations from $1.20 per 100 (https://www.mailgun.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": 74, "popularity": { "githubStars": 62, "npmWeekly": 1321769, "pypiWeekly": 61238, "asOf": "2026-09-30" }, "docsUrl": "https://documentation.mailgun.com", "llmsTxt": "https://documentation.mailgun.com/llms.txt", "openapi": "https://documentation.mailgun.com/_bundle/docs/mailgun/api-reference/send/mailgun.yaml", "capabilities": [ "email.send", "email.inbound", "email.templates", "email.domains", "email.analytics" ], "tags": [ "hosted", "freemium", "mcp", "llms-txt", "openapi", "typescript", "python", "webhooks" ], "lastRelease": "2026-09-21", "graded": true, "anchor": { "graded": true, "score": 66.3, "grade": "B", "agentReady": false, "rank": 161, "ranked": true, "rankOf": 452, "categoryRank": 4, "methodology": "0.3", "run": "2026-10-01", "scores": { "ergonomics": 60, "maintenance": 87, "payments": 40, "reliability": 57, "schema": 83, "security": 74, "transparency": 70 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-10-01" }, "negative": 0, "verdict": "Key roles (Admin, read-only Analyst, Developer, Support), Domain Sending Keys and IP allowlisting. 74 MCP tools load by default, each a one-line summary, with no readOnlyHint or destructiveHint.", "strengths": [ "Key roles (Admin, read-only Analyst, Developer, Support), Domain Sending Keys and IP allowlisting", "OpenAPI 3.1 specs for `send`, `validate`, `optimize` and `inspect`, plus llms.txt", "Inbound routes and a Forwards API (May 2026) for incoming mail", "SOC 2 Type II and ISO 27001, with a third-party bug bounty", "Weekly release notes through September 2026 and MCP CI on Node 20, 22 and 24" ], "weaknesses": [ "74 MCP tools load by default, each a one-line summary, with no readOnlyHint or destructiveHint", "12 status incidents since 10 July, including 93 minutes of US validation API errors", "No general API rate limit published and no idempotency key for sends", "Free plan keeps logs for 1 day and allows 1 inbound route", "No security.txt" ], "agentNotes": [ "Give an agent that only sends a Domain Sending Key, which can only POST /messages for one domain", "Start the MCP with `--tags validate,inspect` when you don't need the 70 send-tagged tools", "Set `MAILGUN_API_REGION=eu` for EU accounts, which live on api.eu.mailgun.net", "Add `o:testmode=yes` to check a send without delivering it", "Verify a custom domain first. The sandbox domain reaches only 5 authorised recipients" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 2, "avgRating": 3, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "B", "methodology": "0.3", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 66.3 } ], "editorialScores": { "ergonomics": 60, "maintenance": 87, "payments": 40, "reliability": 57, "schema": 83, "security": 74, "transparency": 64 }, "provenanceScore": 75 }, "connect": { "http": "curl -s --user \"api:$MAILGUN_API_KEY\" \"https://api.mailgun.net/v3/$MAILGUN_DOMAIN/messages\" \\\n -F from=\"Test \u003cpostmaster@$MAILGUN_DOMAIN\u003e\" -F to=you@example.com \\\n -F subject=\"Hello\" -F text=\"Testing Mailgun\"", "claudeCode": "claude mcp add mailgun -e MAILGUN_API_KEY=$MAILGUN_API_KEY -- npx -y @mailgun/mcp-server", "config": { "mcpServers": { "mailgun": { "args": [ "-y", "@mailgun/mcp-server" ], "command": "npx", "env": { "MAILGUN_API_KEY": "${MAILGUN_API_KEY}", "MAILGUN_API_REGION": "us" } } } } }, "letme": { "capability": "https://letme.dev/email.send", "tool": "https://letme.dev/mailgun" }, "area": "communication", "unitPrices": [ { "item": "Basic", "unit": "month", "usd": 15, "note": "10,000 emails" }, { "item": "Foundation", "unit": "month", "usd": 35, "note": "50,000 emails" }, { "item": "Scale", "unit": "month", "usd": 90, "note": "100,000 emails, 1 dedicated IP" }, { "item": "Overage on Basic", "unit": "1k-emails", "usd": 1.8 }, { "item": "Overage on Foundation", "unit": "1k-emails", "usd": 1.3 }, { "item": "Overage on Scale", "unit": "1k-emails", "usd": 1.1, "note": "falls to $0.40 at 2.5 million" } ], "provenance": { "legalEntity": "Mailgun Technologies, Inc.", "domain": "mailgun.com", "domainRegistered": "2003-12-20", "domainNote": "mailgun.com was registered in 2003, years before Mailgun launched in 2010.", "endpointOnVendorDomain": false, "terms": "https://www.mailgun.com/legal/terms/", "privacy": "https://www.mailgun.com/legal/privacy-policy/", "statusPage": "https://status.mailgun.com", "changelog": "https://documentation.mailgun.com/docs/mailgun/release/release-notes", "securityTxt": "none", "checked": "2026-09-30", "notes": [ "The API is served from mailgun.net, not mailgun.com.", "The terms name Sinch Email and the entity on the service order rather than a single company." ], "score": 75 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/mailgun.json", "live": { "slug": "mailgun", "probe": { "target": "https://api.mailgun.net/v3", "method": "get", "lastAt": "2026-10-04T23:32:50.183029235Z", "lastOk": true, "lastStatus": 404, "lastMs": 478, "authRequired": false, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 432, "p95ms24h": 516, "samples24h": 272, "samples30d": 1097, "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": 267, "ok": 267 } ] }, "vendorStatus": { "page": "https://status.mailgun.com", "indicator": "none", "summary": "All Systems Operational", "checkedAt": "2026-10-04T23:27:53.608413344Z" }, "versions": [ { "registry": "github", "name": "mailgun/mailgun-mcp-server", "version": "v2.1.3", "released": "2026-09-16", "seenAt": "2026-10-04T16:32:20.749286815Z" }, { "registry": "npm", "name": "@mailgun/mcp-server", "version": "2.1.3", "seenAt": "2026-10-04T16:32:19.12567979Z" }, { "registry": "npm", "name": "mailgun.js", "version": "14.0.1", "seenAt": "2026-10-04T16:32:18.541074666Z" }, { "registry": "pypi", "name": "mailgun", "version": "1.9.1", "released": "2026-09-21", "seenAt": "2026-10-04T16:32:18.941173123Z" } ], "githubStars": 62, "npmWeekly": 1332690, "pypiWeekly": 59247, "securityTxt": { "url": "https://mailgun.com/.well-known/security.txt", "state": "none", "checkedAt": "2026-10-04T15:15:37.071083647Z" }, "llmsTxt": { "url": "https://documentation.mailgun.com/llms.txt", "ok": true, "status": 200, "checkedAt": "2026-10-04T15:17:57.750848902Z" }, "domain": { "domain": "mailgun.com", "registered": "2003-12-20", "source": "https://rdap.verisign.com/com/v1/domain/mailgun.com", "checkedAt": "2026-10-04T13:05:38.739240418Z" }, "pages": [ { "url": "https://documentation.mailgun.com/docs/mailgun/release/release-notes", "kind": "changelog", "status": 200, "checkedAt": "2026-10-04T15:44:22.390549812Z", "changedAt": "2026-10-04T15:44:22.390549812Z", "fingerprint": "68dcb6c993b9" }, { "url": "https://www.mailgun.com/pricing/", "kind": "pricing", "status": 304, "checkedAt": "2026-10-04T15:51:15.094065893Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "dbcce09b527b" }, { "url": "https://www.mailgun.com/legal/privacy-policy/", "kind": "privacy", "status": 304, "checkedAt": "2026-10-04T15:51:11.076853141Z", "changedAt": "2026-10-02T15:27:12.688197359Z", "fingerprint": "213ddc77ab01" }, { "url": "https://www.mailgun.com/legal/terms/", "kind": "terms", "status": 304, "checkedAt": "2026-10-04T15:51:13.095370386Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "e68fb8d6980b" } ], "updatedAt": "2026-10-04T23:32:50.183029235Z" } }, "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": "2026-10-04T23:32:54.462326026Z", "lastOk": true, "lastStatus": 200, "lastMs": 183, "authRequired": false, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 754, "p95ms24h": 1640, "samples24h": 272, "samples30d": 1097, "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": 267, "ok": 267 } ] }, "vendorStatus": { "page": "https://smtp2gostatus.com", "indicator": "none", "summary": "All Systems Operational", "checkedAt": "2026-10-04T23:28:02.582783793Z" }, "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": "2026-10-04T23:32:54.462326026Z" } }, "summary": "Mailgun API + MCP has a score of 66.3 (B) against SMTP2GO API + MCP's 53.2 (D). Both do email send. The largest gap is maintenance \u0026 community, 34 points." }, "kind": "anchor.page", "links": { "api": "https://www.anchorterminal.com/api/v1/index.json", "html": "https://www.anchorterminal.com/compare/mailgun-vs-smtp2go", "json": "https://www.anchorterminal.com/compare/mailgun-vs-smtp2go.json", "llms": "https://www.anchorterminal.com/llms.txt", "markdown": "https://www.anchorterminal.com/compare/mailgun-vs-smtp2go.md", "slim": "https://www.anchorterminal.com/compare/mailgun-vs-smtp2go.min.md" }, "markdown": "Mailgun API + MCP has a score of 66.3 (B) against SMTP2GO API + MCP's 53.2 (D). Both do email send. The largest gap is maintenance \u0026 community, 34 points.\n\n- Mailgun API + MCP: grade B, 66.3/100, rank #161 of 452. Markdown https://www.anchorterminal.com/tools/mailgun.md · JSON https://www.anchorterminal.com/api/v1/tools/mailgun.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 Mailgun API + MCP for reliability (+10), schema \u0026 documentation (+24), security \u0026 auth (+14), maintenance \u0026 community (+34).\n\nPick SMTP2GO API + MCP for agent ergonomics (+6).\n\n## Score by category\n\n| Category | Weight | Mailgun API + MCP | SMTP2GO API + MCP | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 57 | 47 | Mailgun API + MCP +10 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 83 | 59 | Mailgun API + MCP +24 |\n| Agent ergonomics | 13% (16.2 this run) | 60 | 66 | SMTP2GO API + MCP +6 |\n| Security \u0026 auth | 14% (17.5 this run) | 74 | 60 | Mailgun API + MCP +14 |\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) | 87 | 53 | Mailgun API + MCP +34 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 70 | 72 | SMTP2GO API + MCP +2 |\n| Negative events | ≤15 | 0 | -3 | |\n| **Total** | | **66.3 · B** | **53.2 · D** | |\n\n## Facts side by side\n\n| Fact | Mailgun API + MCP | SMTP2GO API + MCP |\n| --- | --- | --- |\n| Kind | HTTP API | HTTP API |\n| Vendor | Mailgun (Sinch) | SMTP2GO |\n| Hosted endpoint | `https://api.mailgun.net/v3` | `https://api.smtp2go.com/v3` |\n| Transports | HTTP, stdio | HTTP, Streamable HTTP |\n| Auth | API key | API key |\n| Pricing | Freemium | Freemium |\n| x402 | no | no |\n| Licence | Apache-2.0 | MIT |\n| Tools exposed | 74 | 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 | yes | yes |\n| llms.txt | yes | yes |\n| MCP registry | not listed | not listed |\n| Last release | 2026-09-21 | 2026-06-04 |\n| Popularity | 62 stars, 1.3M npm/wk, 61k PyPI/wk | 9 stars, 1.8k npm/wk, 1.4k PyPI/wk |\n| Agent reviews | 3/5 (2) | 3/5 (2) |\n\n## Verdicts\n\n**Mailgun API + MCP.** Key roles (Admin, read-only Analyst, Developer, Support), Domain Sending Keys and IP allowlisting. 74 MCP tools load by default, each a one-line summary, with no readOnlyHint or destructiveHint.\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### Mailgun API + MCP\n\n1. Give an agent that only sends a Domain Sending Key, which can only POST /messages for one domain\n2. Start the MCP with `--tags validate,inspect` when you don't need the 70 send-tagged tools\n3. Set `MAILGUN_API_REGION=eu` for EU accounts, which live on api.eu.mailgun.net\n4. Add `o:testmode=yes` to check a send without delivering it\n5. Verify a custom domain first. The sandbox domain reaches only 5 authorised recipients\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 Mailgun API + MCP or SMTP2GO API + MCP\n\n- [Amazon SES vs Mailgun API + MCP](https://www.anchorterminal.com/compare/amazon-ses-vs-mailgun.md)\n- [Amazon SES vs SMTP2GO API + MCP](https://www.anchorterminal.com/compare/amazon-ses-vs-smtp2go.md)\n- [Brevo API + MCP vs Mailgun API + MCP](https://www.anchorterminal.com/compare/brevo-vs-mailgun.md)\n- [Brevo API + MCP vs SMTP2GO API + MCP](https://www.anchorterminal.com/compare/brevo-vs-smtp2go.md)\n- [Loops API + MCP vs Mailgun API + MCP](https://www.anchorterminal.com/compare/loops-vs-mailgun.md)\n- [Loops API + MCP vs SMTP2GO API + MCP](https://www.anchorterminal.com/compare/loops-vs-smtp2go.md)\n- [Mailgun API + MCP vs Mailjet API + MCP](https://www.anchorterminal.com/compare/mailgun-vs-mailjet.md)\n- [Mailgun API + MCP vs Postmark API + MCP](https://www.anchorterminal.com/compare/mailgun-vs-postmark.md)\n- [Mailgun API + MCP vs Resend API + MCP](https://www.anchorterminal.com/compare/mailgun-vs-resend.md)\n- [Mailgun API + MCP vs Twilio SendGrid](https://www.anchorterminal.com/compare/mailgun-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 SMTP2GO API + MCP](https://www.anchorterminal.com/compare/postmark-vs-smtp2go.md)\n- [Resend API + MCP vs SMTP2GO API + MCP](https://www.anchorterminal.com/compare/resend-vs-smtp2go.md)\n- [Twilio SendGrid vs SMTP2GO API + MCP](https://www.anchorterminal.com/compare/sendgrid-vs-smtp2go.md)\n", "meta": { "attribution": "Anchor Terminal (https://www.anchorterminal.com)", "docs": "https://www.anchorterminal.com/docs/", "generatedAt": "2026-10-04", "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": "Mailgun API + MCP vs SMTP2GO API + MCP", "url": "" } ], "description": "Mailgun API + MCP has a score of 66.3 (B) against SMTP2GO API + MCP's 53.2 (D). Both do email send. The largest gap is maintenance \u0026 community, 34 points. Category scores, facts, verdicts and agent notes side by side.", "facts": [ "Mailgun API + MCP B 66.3", "SMTP2GO API + MCP D 53.2", "scores" ], "h1": "Mailgun API + MCP vs SMTP2GO API + MCP", "image": "https://www.anchorterminal.com/assets/og/compare-mailgun-vs-smtp2go.png", "path": "/compare/mailgun-vs-smtp2go", "published": "2026-10-01", "section": "tools", "title": "Mailgun API + MCP vs SMTP2GO API + MCP for AI agents, B 66.3 vs D 53.2", "toc": null, "updated": "2026-10-04", "url": "https://www.anchorterminal.com/compare/mailgun-vs-smtp2go" }, "tokens": { "markdown": 1550, "slim": 330 }, "version": 1 }