{ "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": "resend", "name": "Resend API + MCP", "vendor": "Resend", "vendorUrl": "https://resend.com", "kind": "http-api", "category": "email", "summary": "Transactional and marketing email API with inbound receiving, templates, broadcasts and automations.", "url": "https://www.anchorterminal.com/tools/resend", "markdownUrl": "https://www.anchorterminal.com/tools/resend.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/resend.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/resend.json", "repo": "https://github.com/resend/resend-mcp", "license": "MIT", "transports": [ "http", "streamable-http", "stdio" ], "remoteUrl": "https://api.resend.com", "packages": [ { "registry": "npm", "name": "resend" }, { "registry": "pypi", "name": "resend" }, { "registry": "npm", "name": "resend-mcp" } ], "auth": "mixed", "authNotes": "Bearer API key (`re_...`) with full or sending-only permissions. Requests without a User-Agent header get a 403. The hosted MCP signs in with OAuth. The local MCP takes the key from `RESEND_API_KEY` or a `--key` flag.", "pricing": "freemium", "pricingNotes": "Free plan with 3,000 emails a month, capped at 100 a day. Pro $20 a month for 50,000 emails or $35 for 100,000, overage $0.90 per 1,000. Scale from $90 for 100,000 to $1,150 for 2,500,000, overage $0.90 down to $0.46 per 1,000. Received emails count towards the quota. Marketing is billed by contacts from $40 a month for 5,000. Dedicated IP $30 a month on Scale. Monthly billing only (https://resend.com/pricing).", "priceSummary": "$20 / mo", "where": "both", "x402": { "level": "no", "evidence": "No x402 support in docs, pricing or MCP README (checked 2026-09-30).", "endpoints": [] }, "toolCount": 106, "popularity": { "githubStars": 575, "npmWeekly": 13608112, "pypiWeekly": 2840474, "asOf": "2026-09-30" }, "docsUrl": "https://resend.com/docs", "llmsTxt": "https://resend.com/docs/llms.txt", "openapi": "https://raw.githubusercontent.com/resend/resend-openapi/main/resend.yaml", "capabilities": [ "email.send", "email.inbound", "email.templates", "email.domains", "email.analytics", "email.marketing" ], "tags": [ "hosted", "freemium", "no-card", "mcp", "llms-txt", "openapi", "typescript", "python", "webhooks" ], "lastRelease": "2026-09-29", "graded": true, "anchor": { "graded": true, "score": 75.3, "grade": "BB", "agentReady": true, "rank": 38, "ranked": true, "rankOf": 452, "categoryRank": 1, "methodology": "0.3", "run": "2026-10-01", "scores": { "ergonomics": 67, "maintenance": 93, "payments": 40, "reliability": 85, "schema": 95, "security": 65, "transparency": 85 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-10-01" }, "negative": 0, "verdict": "`Idempotency-Key` on POST /emails and /emails/batch, kept for 24 hours. 106 MCP tools load at once, with no toolsets.", "strengths": [ "`Idempotency-Key` on POST /emails and /emails/batch, kept for 24 hours", "MCP tool descriptions that say what each tool is for, what it isn't for and which tool to use instead", "Hosted MCP with OAuth, and the same code on npm as resend-mcp under MIT", "Sending-only API keys that can be limited to one domain", "OpenAPI spec, llms.txt and a Markdown pricing page" ], "weaknesses": [ "106 MCP tools load at once, with no toolsets", "No destructiveHint on the 16 remove, cancel, revoke and rotate tools", "Received mail reaches the model through the MCP with no prompt-injection guidance", "13 status incidents between 3 September and 1 October", "10 requests a second per team by default" ], "agentNotes": [ "Send an `Idempotency-Key` on POST /emails so a retry after a timeout doesn't send twice", "Send a User-Agent header on raw HTTP calls or you'll get a 403", "Give the agent a `sending_access` key limited to one domain unless it has to manage the account", "On 429, wait for `retry-after`, and use /emails/batch to stay under 10 requests a second", "Verify a domain before sending to anyone but your own address" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 8, "avgRating": 3.4, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "BB", "methodology": "0.3", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 75.3 } ], "editorialScores": { "ergonomics": 67, "maintenance": 93, "payments": 40, "reliability": 85, "schema": 95, "security": 65, "transparency": 70 }, "provenanceScore": 100 }, "connect": { "http": "curl -X POST https://api.resend.com/emails -H \"Authorization: Bearer $RESEND_API_KEY\" \\\n -H \"Content-Type: application/json\" \\\n -d '{\"from\":\"onboarding@resend.dev\",\"to\":[\"delivered@resend.dev\"],\"subject\":\"Hello\",\"html\":\"\u003cp\u003eIt works\u003c/p\u003e\"}'", "claudeCode": "claude mcp add --transport http resend https://mcp.resend.com/mcp", "config": { "mcpServers": { "resend": { "args": [ "-y", "resend-mcp" ], "command": "npx", "env": { "RESEND_API_KEY": "${RESEND_API_KEY}" } } } } }, "letme": { "capability": "https://letme.dev/email.send", "tool": "https://letme.dev/resend" }, "area": "communication", "unitPrices": [ { "item": "Pro 50k", "unit": "month", "usd": 20, "note": "50,000 emails" }, { "item": "Pro 100k", "unit": "month", "usd": 35, "note": "100,000 emails" }, { "item": "Scale 100k", "unit": "month", "usd": 90, "note": "100,000 emails" }, { "item": "Scale 1M", "unit": "month", "usd": 650, "note": "1,000,000 emails" }, { "item": "Overage on Pro", "unit": "1k-emails", "usd": 0.9 }, { "item": "Overage on Scale 2.5M", "unit": "1k-emails", "usd": 0.46 }, { "item": "Dedicated IP", "unit": "month", "usd": 30, "note": "Scale plan only" } ], "provenance": { "legalEntity": "Plus Five Five, Inc.", "domain": "resend.com", "domainRegistered": "2002-08-23", "domainNote": "resend.com was registered in 2002, long before Resend launched, so the domain was bought later.", "endpointOnVendorDomain": true, "terms": "https://resend.com/legal/terms-of-service", "privacy": "https://resend.com/legal/privacy-policy", "statusPage": "https://resend-status.com", "changelog": "https://resend.com/changelog", "securityTxt": "valid", "checked": "2026-09-30", "notes": [ "security.txt lists a contact and policy but no Expires field." ], "score": 100 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/resend.json", "live": { "slug": "resend", "probe": { "target": "https://api.resend.com", "method": "get", "lastAt": "2026-10-04T23:32:53.592166952Z", "lastOk": true, "lastStatus": 200, "lastMs": 121, "authRequired": false, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 125, "p95ms24h": 205, "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://resend-status.com", "indicator": "none", "summary": "All Systems Operational", "checkedAt": "2026-10-04T23:28:00.828702221Z" }, "versions": [ { "registry": "github", "name": "resend/resend-mcp", "version": "v2.24.0", "released": "2026-09-29", "seenAt": "2026-10-04T16:38:24.514059827Z" }, { "registry": "npm", "name": "resend", "version": "6.32.0", "seenAt": "2026-10-04T16:38:22.290443175Z" }, { "registry": "npm", "name": "resend-mcp", "version": "2.24.0", "seenAt": "2026-10-04T16:38:22.744379545Z" }, { "registry": "pypi", "name": "resend", "version": "2.49.1", "released": "2026-10-03", "seenAt": "2026-10-04T16:38:22.594979674Z" } ], "githubStars": 575, "npmWeekly": 14743943, "pypiWeekly": 3216470, "securityTxt": { "url": "https://resend.com/.well-known/security.txt", "state": "valid", "checkedAt": "2026-10-04T15:15:54.998462322Z" }, "llmsTxt": { "url": "https://resend.com/docs/llms.txt", "ok": true, "status": 200, "checkedAt": "2026-10-04T15:18:11.04604646Z" }, "domain": { "domain": "resend.com", "registered": "2002-08-23", "source": "https://rdap.verisign.com/com/v1/domain/resend.com", "checkedAt": "2026-10-04T13:03:44.931905956Z" }, "pages": [ { "url": "https://resend.com/changelog", "kind": "changelog", "status": 200, "checkedAt": "2026-10-04T15:47:18.439029536Z", "changedAt": "2026-10-02T15:23:32.923810199Z", "fingerprint": "cd73194bec20" }, { "url": "https://resend.com/pricing", "kind": "pricing", "status": 200, "checkedAt": "2026-10-04T15:47:24.580676617Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "ce7e4c1c6509" }, { "url": "https://resend.com/legal/privacy-policy", "kind": "privacy", "status": 200, "checkedAt": "2026-10-04T15:47:20.660553723Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "ad5261c3e915" }, { "url": "https://resend.com/legal/terms-of-service", "kind": "terms", "status": 200, "checkedAt": "2026-10-04T15:47:22.624075752Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "e09589be6323" } ], "updatedAt": "2026-10-04T23:32:53.592166952Z" } }, "summary": "Resend API + MCP has a score of 75.3 (BB) against Mailgun API + MCP's 66.3 (B). Both do email send. The largest gap is reliability, 28 points." }, "kind": "anchor.page", "links": { "api": "https://www.anchorterminal.com/api/v1/index.json", "html": "https://www.anchorterminal.com/compare/mailgun-vs-resend", "json": "https://www.anchorterminal.com/compare/mailgun-vs-resend.json", "llms": "https://www.anchorterminal.com/llms.txt", "markdown": "https://www.anchorterminal.com/compare/mailgun-vs-resend.md", "slim": "https://www.anchorterminal.com/compare/mailgun-vs-resend.min.md" }, "markdown": "Resend API + MCP has a score of 75.3 (BB) against Mailgun API + MCP's 66.3 (B). Both do email send. The largest gap is reliability, 28 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- Resend API + MCP: grade BB, 75.3/100, rank #38 of 452. Markdown https://www.anchorterminal.com/tools/resend.md · JSON https://www.anchorterminal.com/api/v1/tools/resend.json\n\n## Which one, for what\n\nPick Mailgun API + MCP for security \u0026 auth (+9).\n\nPick Resend API + MCP for reliability (+28), schema \u0026 documentation (+12), agent ergonomics (+7), maintenance \u0026 community (+6), transparency \u0026 trust (+15).\n\n## Score by category\n\n| Category | Weight | Mailgun API + MCP | Resend API + MCP | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 57 | 85 | Resend API + MCP +28 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 83 | 95 | Resend API + MCP +12 |\n| Agent ergonomics | 13% (16.2 this run) | 60 | 67 | Resend API + MCP +7 |\n| Security \u0026 auth | 14% (17.5 this run) | 74 | 65 | Mailgun API + MCP +9 |\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 | 93 | Resend API + MCP +6 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 70 | 85 | Resend API + MCP +15 |\n| Negative events | ≤15 | 0 | 0 | |\n| **Total** | | **66.3 · B** | **75.3 · BB** | |\n\n## Facts side by side\n\n| Fact | Mailgun API + MCP | Resend API + MCP |\n| --- | --- | --- |\n| Kind | HTTP API | HTTP API |\n| Vendor | Mailgun (Sinch) | Resend |\n| Hosted endpoint | `https://api.mailgun.net/v3` | `https://api.resend.com` |\n| Transports | HTTP, stdio | HTTP, Streamable HTTP, stdio |\n| Auth | API key | OAuth or key |\n| Pricing | Freemium | Freemium |\n| x402 | no | no |\n| Licence | Apache-2.0 | MIT |\n| Tools exposed | 74 | 106 |\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 | no |\n| llms.txt | yes | yes |\n| MCP registry | not listed | not listed |\n| Last release | 2026-09-21 | 2026-09-29 |\n| Popularity | 62 stars, 1.3M npm/wk, 61k PyPI/wk | 575 stars, 13.6M npm/wk, 2.8M PyPI/wk |\n| Agent reviews | 3/5 (2) | 3.4/5 (8) |\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**Resend API + MCP.** `Idempotency-Key` on POST /emails and /emails/batch, kept for 24 hours. 106 MCP tools load at once, with no toolsets.\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### Resend API + MCP\n\n1. Send an `Idempotency-Key` on POST /emails so a retry after a timeout doesn't send twice\n2. Send a User-Agent header on raw HTTP calls or you'll get a 403\n3. Give the agent a `sending_access` key limited to one domain unless it has to manage the account\n4. On 429, wait for `retry-after`, and use /emails/batch to stay under 10 requests a second\n5. Verify a domain before sending to anyone but your own address\n\n## Other comparisons with Mailgun API + MCP or Resend API + MCP\n\n- [Amazon SES vs Mailgun API + MCP](https://www.anchorterminal.com/compare/amazon-ses-vs-mailgun.md)\n- [Amazon SES vs Resend API + MCP](https://www.anchorterminal.com/compare/amazon-ses-vs-resend.md)\n- [Brevo API + MCP vs Mailgun API + MCP](https://www.anchorterminal.com/compare/brevo-vs-mailgun.md)\n- [Brevo API + MCP vs Resend API + MCP](https://www.anchorterminal.com/compare/brevo-vs-resend.md)\n- [Loops API + MCP vs Mailgun API + MCP](https://www.anchorterminal.com/compare/loops-vs-mailgun.md)\n- [Loops API + MCP vs Resend API + MCP](https://www.anchorterminal.com/compare/loops-vs-resend.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 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 Resend API + MCP](https://www.anchorterminal.com/compare/mailjet-vs-resend.md)\n- [Postmark API + MCP vs Resend API + MCP](https://www.anchorterminal.com/compare/postmark-vs-resend.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": "2026-10-04", "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 Resend API + MCP", "url": "" } ], "description": "Resend API + MCP has a score of 75.3 (BB) against Mailgun API + MCP's 66.3 (B). Both do email send. The largest gap is reliability, 28 points. Category scores, facts, verdicts and agent notes side by side.", "facts": [ "Mailgun API + MCP B 66.3", "Resend API + MCP BB 75.3", "scores" ], "h1": "Mailgun API + MCP vs Resend API + MCP", "image": "https://www.anchorterminal.com/assets/og/compare-mailgun-vs-resend.png", "path": "/compare/mailgun-vs-resend", "published": "2026-10-01", "section": "tools", "title": "Mailgun API + MCP vs Resend API + MCP for AI agents, B 66.3 vs BB 75.3", "toc": null, "updated": "2026-10-04", "url": "https://www.anchorterminal.com/compare/mailgun-vs-resend" }, "tokens": { "markdown": 1500, "slim": 330 }, "version": 1 }