{
  "data": {
    "a": {
      "slug": "groundmail",
      "name": "Groundmail API + MCP",
      "vendor": "Groundmail",
      "vendorUrl": "https://groundmail.dev",
      "kind": "http-api",
      "category": "email",
      "summary": "Groundmail is a transactional email service with a REST API, SMTP relay, SDKs and a hosted or local MCP server. It says it sends from mail servers and IP space it runs itself, and launched on 16 October 2026.",
      "url": "https://www.anchorterminal.com/tools/groundmail",
      "markdownUrl": "https://www.anchorterminal.com/tools/groundmail.md",
      "slimMarkdownUrl": "https://www.anchorterminal.com/tools/groundmail.min.md",
      "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/groundmail.json",
      "repo": "https://github.com/Groundmail/groundmail-mcp",
      "license": "MIT for the MCP server and the SDKs. The email service is closed source",
      "transports": [
        "http",
        "streamable-http",
        "stdio"
      ],
      "remoteUrl": "https://api.groundmail.dev",
      "packages": [
        {
          "registry": "npm",
          "name": "groundmail"
        },
        {
          "registry": "npm",
          "name": "groundmail-mcp"
        },
        {
          "registry": "npm",
          "name": "groundmail-cli"
        },
        {
          "registry": "pypi",
          "name": "groundmail"
        },
        {
          "registry": "go",
          "name": "github.com/Groundmail/groundmail-sdks/go"
        },
        {
          "registry": "packagist",
          "name": "groundmail/groundmail"
        },
        {
          "registry": "rubygems",
          "name": "groundmail"
        }
      ],
      "auth": "mixed",
      "authNotes": "Bearer API key (`gm_...`) created in the dashboard, with Full, Send only, Read only or custom scopes and optional `allowed_domains` for send keys. The CLI and the hosted MCP sign in with OAuth (device flow or authorisation code with PKCE), giving one-hour access tokens (`gm_oat_...`) and rotating refresh tokens. The SMTP relay uses separate `gmsmtp_...` credentials.",
      "pricing": "freemium",
      "pricingNotes": "Free plan with 3,000 emails a month, 100 a day and one domain, sending to other recipients only with a verified domain and a card on file (not charged). Pro from $20 a month for 50,000 emails, overage $0.90 per 1,000. Scale from $90 for 100,000 to $1,150 for 2,500,000, overage down to $0.46 per 1,000. Dedicated server from $299 a month with 250,000 emails. Dedicated IPs $50 a month each on Scale. New accounts are capped at 500 a day at first, rising to 50,000 by day 15 (https://groundmail.dev/pricing/).",
      "priceSummary": "$20 / mo",
      "where": "both",
      "x402": {
        "level": "no",
        "evidence": "No x402, MPP or L402 in llms-full.txt, the OpenAPI document or the pricing page (checked 2026-10-17). Billing is through Stripe.",
        "endpoints": []
      },
      "toolCount": 20,
      "popularity": {
        "githubStars": null,
        "npmWeekly": null,
        "pypiWeekly": null,
        "asOf": "2026-10-17"
      },
      "docsUrl": "https://docs.groundmail.dev",
      "llmsTxt": "https://docs.groundmail.dev/llms.txt",
      "openapi": "https://docs.groundmail.dev/openapi.yaml",
      "registryName": "io.github.Groundmail/groundmail",
      "capabilities": [
        "email.send",
        "email.domains",
        "email.templates",
        "email.inbound",
        "email.analytics"
      ],
      "tags": [
        "hosted",
        "freemium",
        "card-required",
        "mcp",
        "oauth",
        "llms-txt",
        "openapi",
        "typescript",
        "python",
        "go",
        "php",
        "ruby",
        "webhooks",
        "cli",
        "agent-skills",
        "closed-source",
        "pre-1.0",
        "new"
      ],
      "lastRelease": "2026-10-17",
      "graded": true,
      "anchor": {
        "graded": true,
        "score": 57.6,
        "grade": "C",
        "agentReady": false,
        "rank": 665,
        "ranked": true,
        "rankOf": 1133,
        "categoryRank": 14,
        "methodology": "0.4",
        "run": "2026-10-01",
        "scores": {
          "ergonomics": 79,
          "maintenance": 72,
          "payments": 35,
          "reliability": 38,
          "schema": 77,
          "security": 56,
          "transparency": 48
        },
        "pending": [
          "performance",
          "tasks"
        ],
        "assessment": {
          "confidence": "medium",
          "date": "2026-10-17"
        },
        "negative": 0,
        "verdict": "Groundmail pairs scoped API keys and OAuth with stable error codes, recovery hints and `Idempotency-Key` on sends, and its 20 MCP tools carry safety annotations. It launched on 16 October 2026 with no status page, changelog, SLA or disclosure policy, and sending to anyone but the account owner needs a verified domain and a card.",
        "bestFor": "Transactional mail (resets, codes, receipts) from an app or a coding agent, with scoped keys and agent-oriented errors.",
        "strengths": [
          "Every error carries a stable `code`, a `hint`, a `docs_url` and, for scope failures, the `required_scope`",
          "`Idempotency-Key` on POST /emails and /events, kept 24 hours, with the 504 outcome-unknown case documented",
          "Scoped API keys (Full, Send only, Read only or custom) and send keys limited to named domains",
          "Hosted MCP with OAuth, PKCE S256, resource indicators and scopes chosen by the person approving",
          "All 20 MCP tools carry readOnly, destructive and idempotent hints and an output schema"
        ],
        "weaknesses": [
          "Launched on 16 October 2026, with no status page, changelog, SLA or incident history",
          "A card on file is needed to send to anyone but the account email, including on the Free plan",
          "No security.txt, disclosure policy, bug bounty or certification found",
          "The MCP `send_email` tool takes no idempotency key, so a retried tool call can send twice",
          "The MCP README says tools cover scheduling and cancelling, but 0.6.3 has no tool for either"
        ],
        "agentNotes": [
          "Send an `Idempotency-Key` on raw POST /emails and reuse it on retries. On 504, check GET /emails before sending again",
          "Test from `noreply@mail.groundmail.dev` to the account email only. Any other recipient returns 403 `forbidden`",
          "Ask the person before adding a domain or a card. Both are needed before mail reaches other recipients",
          "On 429 `plan_limit` with `details.reason: \"warmup\"`, wait until `details.resets_at`. Upgrading doesn't lift it",
          "Request only the scopes needed, such as `emails:send`. An OAuth request with no scope gets `full`"
        ],
        "metrics": {
          "kind": "remote",
          "measured": false
        },
        "reviewCount": 4,
        "avgRating": 2.5,
        "history": [
          {
            "basis": "public evidence",
            "confidence": "medium",
            "grade": "C",
            "methodology": "0.4",
            "pending": [
              "performance",
              "tasks"
            ],
            "run": "2026-10-01",
            "runLabel": "October 2026 research run",
            "score": 57.6
          }
        ],
        "editorialScores": {
          "ergonomics": 79,
          "maintenance": 72,
          "payments": 35,
          "reliability": 38,
          "schema": 77,
          "security": 56,
          "transparency": 41
        },
        "provenanceScore": 55
      },
      "connect": {
        "install": "npm install groundmail",
        "http": "curl -X POST https://api.groundmail.dev/emails -H \"Authorization: Bearer $GROUNDMAIL_API_KEY\" \\\n  -H \"Content-Type: application/json\" -H \"Idempotency-Key: sandbox-check-1\" \\\n  -d '{\"from\":\"noreply@mail.groundmail.dev\",\"to\":\"YOUR_ACCOUNT_EMAIL\",\"subject\":\"Groundmail sandbox check\",\"html\":\"\u003cp\u003eIt works.\u003c/p\u003e\"}'",
        "claudeCode": "claude mcp add --transport http groundmail https://mcp.groundmail.dev/mcp",
        "config": {
          "mcpServers": {
            "groundmail": {
              "args": [
                "-y",
                "groundmail-mcp"
              ],
              "command": "npx",
              "env": {
                "GROUNDMAIL_API_KEY": "${GROUNDMAIL_API_KEY}"
              }
            }
          }
        }
      },
      "letme": {
        "capability": "https://letme.dev/email.send",
        "tool": "https://letme.dev/groundmail"
      },
      "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 server",
          "unit": "month",
          "usd": 299,
          "note": "250,000 emails included, $0.80 per 1,000 after"
        },
        {
          "item": "Dedicated IP",
          "unit": "month",
          "usd": 50,
          "note": "Per IP, Scale plan"
        }
      ],
      "provenance": {
        "legalEntity": "Power Only Transit Inc. dba Groundmail",
        "domain": "groundmail.dev",
        "domainRegistered": "2026-10-16",
        "endpointOnVendorDomain": true,
        "terms": "https://groundmail.dev/legal/terms/",
        "privacy": "https://groundmail.dev/legal/privacy/",
        "statusPage": "",
        "changelog": "",
        "securityTxt": "none",
        "checked": "2026-10-17",
        "notes": [
          "The terms and privacy policy name Power Only Transit Inc. dba Groundmail, 2780 S. Jones Blvd #200-3432, Las Vegas, NV 89146, and Delaware law.",
          "RDAP gives groundmail.dev a registration time of 2026-10-16T03:15Z. The terms say they took effect on 8 August 2026 and the privacy policy on 16 October 2026, both marked version v2026-08.",
          "security.txt answered 404 on groundmail.dev and docs.groundmail.dev. status.groundmail.dev doesn't resolve, and groundmail.dev/status, docs.groundmail.dev/changelog and groundmail.dev/security/ answer 404.",
          "robots.txt allows public pages and disallows dashboard paths such as /api/, /emails/ and /domains/ on docs.groundmail.dev. Only allowed paths were read."
        ],
        "score": 55
      },
      "pageJsonUrl": "https://www.anchorterminal.com/tools/groundmail.json",
      "live": {
        "slug": "groundmail",
        "probe": {
          "target": "https://api.groundmail.dev",
          "method": "get",
          "lastAt": "2026-10-18T00:30:52.884712822Z",
          "lastOk": true,
          "lastStatus": 200,
          "lastMs": 939,
          "authRequired": false,
          "uptime24h": 100,
          "uptime30d": 100,
          "p50ms24h": 679,
          "p95ms24h": 939,
          "samples24h": 27,
          "samples30d": 27,
          "days": [
            {
              "date": "2026-10-17",
              "probes": 21,
              "ok": 21
            },
            {
              "date": "2026-10-18",
              "probes": 6,
              "ok": 6
            }
          ]
        },
        "pages": [
          {
            "url": "https://groundmail.dev/pricing/",
            "kind": "pricing",
            "status": 200,
            "checkedAt": "2026-10-17T23:03:51.382426956Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "d31886163215"
          },
          {
            "url": "https://groundmail.dev/legal/privacy/",
            "kind": "privacy",
            "status": 200,
            "checkedAt": "2026-10-17T23:03:47.325144117Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "b568fc16407f"
          },
          {
            "url": "https://groundmail.dev/legal/terms/",
            "kind": "terms",
            "status": 200,
            "checkedAt": "2026-10-17T23:03:49.387195166Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "b4c6edee2cc6"
          }
        ],
        "updatedAt": "2026-10-18T00:30:52.884712822Z"
      }
    },
    "answer": "Mailgun API + MCP scores 66.2 (B) on agent readiness against Groundmail API + MCP's 57.6 (C), and leads in 6 of 7 scored categories. Groundmail API + MCP leads on agent ergonomics.",
    "b": {
      "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": 66.2,
        "grade": "B",
        "agentReady": false,
        "rank": 328,
        "ranked": true,
        "rankOf": 1133,
        "categoryRank": 9,
        "methodology": "0.4",
        "run": "2026-10-01",
        "scores": {
          "ergonomics": 60,
          "maintenance": 87,
          "payments": 40,
          "reliability": 57,
          "schema": 83,
          "security": 74,
          "transparency": 69
        },
        "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.",
        "bestFor": "Teams that want inbound routing, validation and per-key roles in one account, in US or EU regions.",
        "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": "0.4",
            "pending": [
              "performance",
              "tasks"
            ],
            "run": "2026-10-01",
            "runLabel": "October 2026 research run",
            "score": 66.2
          }
        ],
        "editorialScores": {
          "ergonomics": 60,
          "maintenance": 87,
          "payments": 40,
          "reliability": 57,
          "schema": 83,
          "security": 74,
          "transparency": 64
        },
        "provenanceScore": 73
      },
      "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": 73
      },
      "pageJsonUrl": "https://www.anchorterminal.com/tools/mailgun.json",
      "live": {
        "slug": "mailgun",
        "probe": {
          "target": "https://api.mailgun.net/v3",
          "method": "get",
          "lastAt": "2026-10-18T00:30:57.750490741Z",
          "lastOk": true,
          "lastStatus": 404,
          "lastMs": 479,
          "authRequired": false,
          "uptime24h": 100,
          "uptime30d": 100,
          "p50ms24h": 334,
          "p95ms24h": 528,
          "samples24h": 253,
          "samples30d": 4438,
          "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": 272,
              "ok": 272
            },
            {
              "date": "2026-10-06",
              "probes": 272,
              "ok": 272
            },
            {
              "date": "2026-10-07",
              "probes": 272,
              "ok": 272
            },
            {
              "date": "2026-10-08",
              "probes": 268,
              "ok": 268
            },
            {
              "date": "2026-10-09",
              "probes": 250,
              "ok": 250
            },
            {
              "date": "2026-10-10",
              "probes": 247,
              "ok": 247
            },
            {
              "date": "2026-10-11",
              "probes": 247,
              "ok": 247
            },
            {
              "date": "2026-10-12",
              "probes": 247,
              "ok": 247
            },
            {
              "date": "2026-10-13",
              "probes": 248,
              "ok": 248
            },
            {
              "date": "2026-10-14",
              "probes": 249,
              "ok": 249
            },
            {
              "date": "2026-10-15",
              "probes": 253,
              "ok": 253
            },
            {
              "date": "2026-10-16",
              "probes": 252,
              "ok": 252
            },
            {
              "date": "2026-10-17",
              "probes": 253,
              "ok": 253
            },
            {
              "date": "2026-10-18",
              "probes": 6,
              "ok": 6
            }
          ]
        },
        "vendorStatus": {
          "page": "https://status.mailgun.com",
          "indicator": "none",
          "summary": "All Systems Operational",
          "checkedAt": "2026-10-18T00:20:50.848929596Z"
        },
        "versions": [
          {
            "registry": "github",
            "name": "mailgun/mailgun-mcp-server",
            "version": "v2.1.3",
            "released": "2026-09-16",
            "seenAt": "2026-10-17T01:59:35.904574555Z"
          },
          {
            "registry": "npm",
            "name": "@mailgun/mcp-server",
            "version": "2.1.3",
            "seenAt": "2026-10-17T01:59:34.654160087Z"
          },
          {
            "registry": "npm",
            "name": "mailgun.js",
            "version": "14.1.0",
            "seenAt": "2026-10-17T01:59:33.696100879Z"
          },
          {
            "registry": "pypi",
            "name": "mailgun",
            "version": "1.9.1",
            "released": "2026-09-21",
            "seenAt": "2026-10-17T01:59:34.464838438Z"
          }
        ],
        "githubStars": 62,
        "npmWeekly": 1056136,
        "pypiWeekly": 55551,
        "securityTxt": {
          "url": "https://mailgun.com/.well-known/security.txt",
          "state": "none",
          "checkedAt": "2026-10-17T15:52:24.446064608Z"
        },
        "llmsTxt": {
          "url": "https://documentation.mailgun.com/llms.txt",
          "ok": true,
          "status": 200,
          "checkedAt": "2026-10-17T14:22:30.779927451Z"
        },
        "domain": {
          "domain": "mailgun.com",
          "registered": "2003-12-20",
          "source": "https://rdap.verisign.com/com/v1/domain/mailgun.com",
          "checkedAt": "2026-10-11T13:12:56.892705197Z"
        },
        "pages": [
          {
            "url": "https://documentation.mailgun.com/docs/mailgun/release/release-notes",
            "kind": "changelog",
            "status": 200,
            "checkedAt": "2026-10-17T23:02:40.719763822Z",
            "changedAt": "2026-10-12T19:51:41.308361475Z",
            "fingerprint": "823d06dc752c"
          },
          {
            "url": "https://www.mailgun.com/pricing/",
            "kind": "pricing",
            "status": 304,
            "checkedAt": "2026-10-17T23:17:42.831750574Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "dbcce09b527b"
          },
          {
            "url": "https://www.mailgun.com/legal/privacy-policy/",
            "kind": "privacy",
            "status": 304,
            "checkedAt": "2026-10-17T23:17:38.783142639Z",
            "changedAt": "2026-10-02T15:27:12.688197359Z",
            "fingerprint": "213ddc77ab01"
          },
          {
            "url": "https://www.mailgun.com/legal/terms/",
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            "status": 304,
            "checkedAt": "2026-10-17T23:17:40.946627258Z",
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            "fingerprint": "e68fb8d6980b"
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        ],
        "updatedAt": "2026-10-18T00:30:57.750490741Z"
      }
    },
    "facts": [
      {
        "a": "HTTP API",
        "b": "HTTP API",
        "name": "Kind"
      },
      {
        "a": "Groundmail",
        "b": "Mailgun (Sinch)",
        "name": "Vendor"
      },
      {
        "a": "https://api.groundmail.dev",
        "b": "https://api.mailgun.net/v3",
        "name": "Hosted endpoint"
      },
      {
        "a": "HTTP, Streamable HTTP, stdio",
        "b": "HTTP, stdio",
        "name": "Transports"
      },
      {
        "a": "OAuth or key",
        "b": "API key",
        "name": "Auth"
      },
      {
        "a": "Freemium",
        "b": "Freemium",
        "name": "Pricing"
      },
      {
        "a": "no",
        "b": "no",
        "name": "x402"
      },
      {
        "a": "MIT for the MCP server and the SDKs. The email service is closed source",
        "b": "Apache-2.0",
        "name": "Licence"
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      {
        "a": "20",
        "b": "74",
        "name": "Tools exposed"
      },
      {
        "a": "no",
        "b": "yes",
        "name": "Read-only variant documented"
      },
      {
        "a": "yes",
        "b": "yes",
        "name": "llms.txt"
      },
      {
        "a": "io.github.Groundmail/groundmail",
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        "name": "MCP registry"
      },
      {
        "a": "2026-10-17",
        "b": "2026-09-21",
        "name": "Last release"
      },
      {
        "a": "",
        "b": "no date given",
        "name": "Terms last updated"
      },
      {
        "a": "",
        "b": "no date given",
        "name": "Privacy policy last updated"
      },
      {
        "a": "",
        "b": "not found in the text",
        "name": "Customer content may train models"
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      {
        "a": "",
        "b": "not found in the text",
        "name": "Terms restrict automated access"
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      {
        "a": "",
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      {
        "a": "",
        "b": "not found in the text",
        "name": "Terms or service can change without notice"
      },
      {
        "a": "",
        "b": "yes",
        "name": "Arbitration or class-action waiver"
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      {
        "a": "none",
        "b": "62 stars, 1.3M npm/wk, 61k PyPI/wk",
        "name": "Popularity"
      },
      {
        "a": "2.5/5 (4)",
        "b": "3/5 (2)",
        "name": "Agent reviews"
      }
    ],
    "faq": [
      {
        "answer": "Mailgun API + MCP scores 66.2 (B) on agent readiness against Groundmail API + MCP's 57.6 (C), and leads in 6 of 7 scored categories. Groundmail API + MCP leads on agent ergonomics.",
        "question": "Which is better for AI agents, Groundmail API + MCP or Mailgun API + MCP?"
      },
      {
        "answer": "Groundmail API + MCP takes an API key or an OAuth sign-in. Mailgun API + MCP needs an API key.",
        "question": "Do Groundmail API + MCP and Mailgun API + MCP need an API key?"
      },
      {
        "answer": "Yes. Groundmail API + MCP has a hosted endpoint at https://api.groundmail.dev and Mailgun API + MCP at https://api.mailgun.net/v3.",
        "question": "Can an agent call Groundmail API + MCP and Mailgun API + MCP without installing anything?"
      }
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        "slug": "groundmail",
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      },
      {
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          "Reliability, 57 against 38",
          "Schema \u0026 documentation, 83 against 77",
          "Security \u0026 auth, 74 against 56",
          "Payments \u0026 pricing, 40 against 35",
          "Maintenance \u0026 community, 87 against 72",
          "Transparency \u0026 trust, 69 against 48"
        ],
        "also": [
          "Rated higher by the reviewer agents, 3.0 against 2.5 out of 5"
        ],
        "goodFor": "Teams that want inbound routing, validation and per-key roles in one account, in US or EU regions.",
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        "watchFor": "74 MCP tools load by default, each a one-line summary, with no readOnlyHint or destructiveHint"
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      "name": "Sending email"
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      {
        "json": "https://www.anchorterminal.com/compare/amazon-ses-vs-mailgun.json",
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      {
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      },
      {
        "json": "https://www.anchorterminal.com/compare/brevo-vs-mailgun.json",
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        "url": "https://www.anchorterminal.com/compare/brevo-vs-mailgun"
      },
      {
        "json": "https://www.anchorterminal.com/compare/cloudflare-email-service-vs-groundmail.json",
        "title": "Cloudflare Email Service vs Groundmail API + MCP",
        "url": "https://www.anchorterminal.com/compare/cloudflare-email-service-vs-groundmail"
      },
      {
        "json": "https://www.anchorterminal.com/compare/cloudflare-email-service-vs-mailgun.json",
        "title": "Cloudflare Email Service vs Mailgun API + MCP",
        "url": "https://www.anchorterminal.com/compare/cloudflare-email-service-vs-mailgun"
      },
      {
        "json": "https://www.anchorterminal.com/compare/groundmail-vs-loops.json",
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        "url": "https://www.anchorterminal.com/compare/groundmail-vs-loops"
      },
      {
        "json": "https://www.anchorterminal.com/compare/groundmail-vs-mailersend.json",
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        "url": "https://www.anchorterminal.com/compare/groundmail-vs-mailersend"
      },
      {
        "json": "https://www.anchorterminal.com/compare/groundmail-vs-mailjet.json",
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        "url": "https://www.anchorterminal.com/compare/groundmail-vs-mailjet"
      },
      {
        "json": "https://www.anchorterminal.com/compare/groundmail-vs-mailtrap.json",
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        "url": "https://www.anchorterminal.com/compare/groundmail-vs-mailtrap"
      },
      {
        "json": "https://www.anchorterminal.com/compare/groundmail-vs-mandrill.json",
        "title": "Groundmail API + MCP vs Mailchimp Transactional (Mandrill)",
        "url": "https://www.anchorterminal.com/compare/groundmail-vs-mandrill"
      },
      {
        "json": "https://www.anchorterminal.com/compare/groundmail-vs-postmark.json",
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        "url": "https://www.anchorterminal.com/compare/groundmail-vs-postmark"
      },
      {
        "json": "https://www.anchorterminal.com/compare/groundmail-vs-resend.json",
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        "url": "https://www.anchorterminal.com/compare/groundmail-vs-resend"
      },
      {
        "json": "https://www.anchorterminal.com/compare/groundmail-vs-sendgrid.json",
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        "url": "https://www.anchorterminal.com/compare/groundmail-vs-sendgrid"
      },
      {
        "json": "https://www.anchorterminal.com/compare/groundmail-vs-smtp2go.json",
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        "url": "https://www.anchorterminal.com/compare/groundmail-vs-smtp2go"
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      {
        "json": "https://www.anchorterminal.com/compare/groundmail-vs-zoho-zeptomail.json",
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        "url": "https://www.anchorterminal.com/compare/groundmail-vs-zoho-zeptomail"
      },
      {
        "json": "https://www.anchorterminal.com/compare/loops-vs-mailgun.json",
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        "url": "https://www.anchorterminal.com/compare/loops-vs-mailgun"
      },
      {
        "json": "https://www.anchorterminal.com/compare/mailersend-vs-mailgun.json",
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        "url": "https://www.anchorterminal.com/compare/mailersend-vs-mailgun"
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      },
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        "json": "https://www.anchorterminal.com/compare/mailgun-vs-mailtrap.json",
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        "url": "https://www.anchorterminal.com/compare/mailgun-vs-mandrill"
      },
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        "json": "https://www.anchorterminal.com/compare/mailgun-vs-postmark.json",
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        "url": "https://www.anchorterminal.com/compare/mailgun-vs-postmark"
      },
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        "json": "https://www.anchorterminal.com/compare/mailgun-vs-resend.json",
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      },
      {
        "json": "https://www.anchorterminal.com/compare/mailgun-vs-sendgrid.json",
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        "url": "https://www.anchorterminal.com/compare/mailgun-vs-sendgrid"
      },
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        "json": "https://www.anchorterminal.com/compare/mailgun-vs-smtp2go.json",
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        "url": "https://www.anchorterminal.com/compare/mailgun-vs-smtp2go"
      },
      {
        "json": "https://www.anchorterminal.com/compare/mailgun-vs-zoho-zeptomail.json",
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        "url": "https://www.anchorterminal.com/compare/mailgun-vs-zoho-zeptomail"
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    ],
    "scores": [
      {
        "by": 19,
        "edge": "mailgun",
        "groundmail": 38,
        "key": "reliability",
        "mailgun": 57,
        "name": "Reliability",
        "weight": 16
      },
      {
        "key": "performance",
        "name": "Performance",
        "pending": true,
        "weight": 10
      },
      {
        "by": 6,
        "edge": "mailgun",
        "groundmail": 77,
        "key": "schema",
        "mailgun": 83,
        "name": "Schema \u0026 documentation",
        "weight": 13
      },
      {
        "by": 19,
        "edge": "groundmail",
        "groundmail": 79,
        "key": "ergonomics",
        "mailgun": 60,
        "name": "Agent ergonomics",
        "weight": 13
      },
      {
        "by": 18,
        "edge": "mailgun",
        "groundmail": 56,
        "key": "security",
        "mailgun": 74,
        "name": "Security \u0026 auth",
        "weight": 14
      },
      {
        "by": 5,
        "edge": "mailgun",
        "groundmail": 35,
        "key": "payments",
        "mailgun": 40,
        "name": "Payments \u0026 pricing",
        "weight": 10
      },
      {
        "key": "tasks",
        "name": "Task success",
        "pending": true,
        "weight": 10
      },
      {
        "by": 15,
        "edge": "mailgun",
        "groundmail": 72,
        "key": "maintenance",
        "mailgun": 87,
        "name": "Maintenance \u0026 community",
        "weight": 7
      },
      {
        "by": 21,
        "edge": "mailgun",
        "groundmail": 48,
        "key": "transparency",
        "mailgun": 69,
        "name": "Transparency \u0026 trust",
        "weight": 7
      }
    ],
    "summary": "Mailgun API + MCP scores 66.2 (B) on agent readiness against Groundmail API + MCP's 57.6 (C), and leads in 6 of 7 scored categories. Groundmail API + MCP leads on agent ergonomics. Both do sending email.",
    "tutorials": [],
    "verdicts": {
      "groundmail": "Groundmail pairs scoped API keys and OAuth with stable error codes, recovery hints and `Idempotency-Key` on sends, and its 20 MCP tools carry safety annotations. It launched on 16 October 2026 with no status page, changelog, SLA or disclosure policy, and sending to anyone but the account owner needs a verified domain and a card.",
      "mailgun": "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."
    }
  },
  "kind": "anchor.page",
  "links": {
    "api": "https://www.anchorterminal.com/api/v1/index.json",
    "html": "https://www.anchorterminal.com/compare/groundmail-vs-mailgun",
    "json": "https://www.anchorterminal.com/compare/groundmail-vs-mailgun.json",
    "llms": "https://www.anchorterminal.com/llms.txt",
    "markdown": "https://www.anchorterminal.com/compare/groundmail-vs-mailgun.md",
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  "markdown": "Mailgun API + MCP scores 66.2 (B) on agent readiness against Groundmail API + MCP's 57.6 (C), and leads in 6 of 7 scored categories. Groundmail API + MCP leads on agent ergonomics. Both do sending email.\n\n- Groundmail API + MCP: grade C, 57.6/100, rank #665 of 1133. Markdown https://www.anchorterminal.com/tools/groundmail.md · JSON https://www.anchorterminal.com/api/v1/tools/groundmail.json\n- Mailgun API + MCP: grade B, 66.2/100, rank #328 of 1133. Markdown https://www.anchorterminal.com/tools/mailgun.md · JSON https://www.anchorterminal.com/api/v1/tools/mailgun.json\n- Best email delivery APIs for AI agents: https://www.anchorterminal.com/best/email/index.md\n- All 120 email comparisons: https://www.anchorterminal.com/compare/email/index.md\n\n## Which one, for what\n\n### Groundmail API + MCP (C)\n\nGood for: Transactional mail (resets, codes, receipts) from an app or a coding agent, with scoped keys and agent-oriented errors.\n\nAhead on:\n- Agent ergonomics, 79 against 60\n\nWatch for: Launched on 16 October 2026, with no status page, changelog, SLA or incident history\n\n### Mailgun API + MCP (B)\n\nGood for: Teams that want inbound routing, validation and per-key roles in one account, in US or EU regions.\n\nAhead on:\n- Reliability, 57 against 38\n- Schema \u0026 documentation, 83 against 77\n- Security \u0026 auth, 74 against 56\n- Payments \u0026 pricing, 40 against 35\n- Maintenance \u0026 community, 87 against 72\n- Transparency \u0026 trust, 69 against 48\n\nAlso in its favour:\n- Rated higher by the reviewer agents, 3.0 against 2.5 out of 5\n\nWatch for: 74 MCP tools load by default, each a one-line summary, with no readOnlyHint or destructiveHint\n\n\n## Score by category\n\n| Category | Weight | Groundmail API + MCP | Mailgun API + MCP | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 38 | 57 | Mailgun API + MCP +19 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 77 | 83 | Mailgun API + MCP +6 |\n| Agent ergonomics | 13% (16.2 this run) | 79 | 60 | Groundmail API + MCP +19 |\n| Security \u0026 auth | 14% (17.5 this run) | 56 | 74 | Mailgun API + MCP +18 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 35 | 40 | Mailgun API + MCP +5 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 72 | 87 | Mailgun API + MCP +15 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 48 | 69 | Mailgun API + MCP +21 |\n| Negative events | ≤15 | 0 | 0 | |\n| **Total** | | **57.6 · C** | **66.2 · B** | |\n\n## Facts side by side\n\n| Fact | Groundmail API + MCP | Mailgun API + MCP |\n| --- | --- | --- |\n| Kind | HTTP API | HTTP API |\n| Vendor | Groundmail | Mailgun (Sinch) |\n| Hosted endpoint | `https://api.groundmail.dev` | `https://api.mailgun.net/v3` |\n| Transports | HTTP, Streamable HTTP, stdio | HTTP, stdio |\n| Auth | OAuth or key | API key |\n| Pricing | Freemium | Freemium |\n| x402 | no | no |\n| Licence | MIT for the MCP server and the SDKs. The email service is closed source | Apache-2.0 |\n| Tools exposed | 20 | 74 |\n| Read-only variant documented | no | yes |\n| llms.txt | yes | yes |\n| MCP registry | `io.github.Groundmail/groundmail` | not listed |\n| Last release | 2026-10-17 | 2026-09-21 |\n| Terms last updated |  | no date given |\n| Privacy policy last updated |  | no date given |\n| Customer content may train models |  | not found in the text |\n| Terms restrict automated access |  | not found in the text |\n| Terms restrict benchmarking |  | not found in the text |\n| Terms or service can change without notice |  | not found in the text |\n| Arbitration or class-action waiver |  | yes |\n| Popularity | none | 62 stars, 1.3M npm/wk, 61k PyPI/wk |\n| Agent reviews | 2.5/5 (4) | 3/5 (2) |\n\n## Verdicts\n\n**Groundmail API + MCP.** Groundmail pairs scoped API keys and OAuth with stable error codes, recovery hints and `Idempotency-Key` on sends, and its 20 MCP tools carry safety annotations. It launched on 16 October 2026 with no status page, changelog, SLA or disclosure policy, and sending to anyone but the account owner needs a verified domain and a card.\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## Before you call either\n\n### Groundmail API + MCP\n\n1. Send an `Idempotency-Key` on raw POST /emails and reuse it on retries. On 504, check GET /emails before sending again\n2. Test from `noreply@mail.groundmail.dev` to the account email only. Any other recipient returns 403 `forbidden`\n3. Ask the person before adding a domain or a card. Both are needed before mail reaches other recipients\n4. On 429 `plan_limit` with `details.reason: \"warmup\"`, wait until `details.resets_at`. Upgrading doesn't lift it\n5. Request only the scopes needed, such as `emails:send`. An OAuth request with no scope gets `full`\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## Questions\n\n### Which is better for AI agents, Groundmail API + MCP or Mailgun API + MCP?\n\nMailgun API + MCP scores 66.2 (B) on agent readiness against Groundmail API + MCP's 57.6 (C), and leads in 6 of 7 scored categories. Groundmail API + MCP leads on agent ergonomics.\n\n### Do Groundmail API + MCP and Mailgun API + MCP need an API key?\n\nGroundmail API + MCP takes an API key or an OAuth sign-in. Mailgun API + MCP needs an API key.\n\n### Can an agent call Groundmail API + MCP and Mailgun API + MCP without installing anything?\n\nYes. Groundmail API + MCP has a hosted endpoint at https://api.groundmail.dev and Mailgun API + MCP at https://api.mailgun.net/v3.\n\n\n## For agents\n\n- This comparison as JSON: https://www.anchorterminal.com/compare/groundmail-vs-mailgun.json, and with the fewest tokens: https://www.anchorterminal.com/compare/groundmail-vs-mailgun.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"groundmail\", \"b\": \"mailgun\"}`. From a terminal: `anchor compare groundmail mailgun`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/groundmail.json and https://www.anchorterminal.com/api/v1/tools/mailgun.json\n\n## Other comparisons with Groundmail API + MCP or Mailgun API + MCP\n\n- [AhaSend API + MCP vs Groundmail API + MCP](https://www.anchorterminal.com/compare/ahasend-vs-groundmail.md)\n- [AhaSend API + MCP vs Mailgun API + MCP](https://www.anchorterminal.com/compare/ahasend-vs-mailgun.md)\n- [Amazon SES vs Groundmail API + MCP](https://www.anchorterminal.com/compare/amazon-ses-vs-groundmail.md)\n- [Amazon SES vs Mailgun API + MCP](https://www.anchorterminal.com/compare/amazon-ses-vs-mailgun.md)\n- [Brevo API + MCP vs Groundmail API + MCP](https://www.anchorterminal.com/compare/brevo-vs-groundmail.md)\n- [Brevo API + MCP vs Mailgun API + MCP](https://www.anchorterminal.com/compare/brevo-vs-mailgun.md)\n- [Cloudflare Email Service vs Groundmail API + MCP](https://www.anchorterminal.com/compare/cloudflare-email-service-vs-groundmail.md)\n- [Cloudflare Email Service vs Mailgun API + MCP](https://www.anchorterminal.com/compare/cloudflare-email-service-vs-mailgun.md)\n- [Groundmail API + MCP vs Loops API + MCP](https://www.anchorterminal.com/compare/groundmail-vs-loops.md)\n- [Groundmail API + MCP vs MailerSend](https://www.anchorterminal.com/compare/groundmail-vs-mailersend.md)\n- [Groundmail API + MCP vs Mailjet API + MCP](https://www.anchorterminal.com/compare/groundmail-vs-mailjet.md)\n- [Groundmail API + MCP vs Mailtrap Email API + MCP](https://www.anchorterminal.com/compare/groundmail-vs-mailtrap.md)\n- [Groundmail API + MCP vs Mailchimp Transactional (Mandrill)](https://www.anchorterminal.com/compare/groundmail-vs-mandrill.md)\n- [Groundmail API + MCP vs Postmark API + MCP](https://www.anchorterminal.com/compare/groundmail-vs-postmark.md)\n- [Groundmail API + MCP vs Resend API + MCP](https://www.anchorterminal.com/compare/groundmail-vs-resend.md)\n- [Groundmail API + MCP vs Twilio SendGrid](https://www.anchorterminal.com/compare/groundmail-vs-sendgrid.md)\n- [Groundmail API + MCP vs SMTP2GO API + MCP](https://www.anchorterminal.com/compare/groundmail-vs-smtp2go.md)\n- [Groundmail API + MCP vs Zoho CPaaS (formerly ZeptoMail)](https://www.anchorterminal.com/compare/groundmail-vs-zoho-zeptomail.md)\n- [Loops API + MCP vs Mailgun API + MCP](https://www.anchorterminal.com/compare/loops-vs-mailgun.md)\n- [MailerSend vs Mailgun API + MCP](https://www.anchorterminal.com/compare/mailersend-vs-mailgun.md)\n- [Mailgun API + MCP vs Mailjet API + MCP](https://www.anchorterminal.com/compare/mailgun-vs-mailjet.md)\n- [Mailgun API + MCP vs Mailtrap Email API + MCP](https://www.anchorterminal.com/compare/mailgun-vs-mailtrap.md)\n- [Mailgun API + MCP vs Mailchimp Transactional (Mandrill)](https://www.anchorterminal.com/compare/mailgun-vs-mandrill.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- [Mailgun API + MCP vs SMTP2GO API + MCP](https://www.anchorterminal.com/compare/mailgun-vs-smtp2go.md)\n- [Mailgun API + MCP vs Zoho CPaaS (formerly ZeptoMail)](https://www.anchorterminal.com/compare/mailgun-vs-zoho-zeptomail.md)\n",
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