{
  "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": "2026-10-18T00:14:41.979024896Z",
          "lastOk": true,
          "lastStatus": 200,
          "lastMs": 648,
          "authRequired": false,
          "uptime24h": 100,
          "uptime30d": 100,
          "p50ms24h": 677,
          "p95ms24h": 810,
          "samples24h": 24,
          "samples30d": 24,
          "days": [
            {
              "date": "2026-10-17",
              "probes": 21,
              "ok": 21
            },
            {
              "date": "2026-10-18",
              "probes": 3,
              "ok": 3
            }
          ]
        },
        "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": "2026-10-18T00:14:41.979024896Z"
      }
    },
    "answer": "Groundmail API + MCP scores 57.6 (C) on agent readiness against SMTP2GO API + MCP's 53.1 (D), and leads in 3 of 7 scored categories. SMTP2GO API + MCP leads on reliability, payments \u0026 pricing and transparency \u0026 trust.",
    "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": 53.1,
        "grade": "D",
        "agentReady": false,
        "rank": 801,
        "ranked": true,
        "rankOf": 1133,
        "categoryRank": 15,
        "methodology": "0.4",
        "run": "2026-10-01",
        "scores": {
          "ergonomics": 66,
          "maintenance": 53,
          "payments": 40,
          "reliability": 47,
          "schema": 59,
          "security": 60,
          "transparency": 71
        },
        "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.",
        "bestFor": "Small senders who want simple pricing, per-key permissions and a hosted MCP with almost no context cost.",
        "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": "0.4",
            "pending": [
              "performance",
              "tasks"
            ],
            "run": "2026-10-01",
            "runLabel": "October 2026 research run",
            "score": 53.1
          }
        ],
        "editorialScores": {
          "ergonomics": 66,
          "maintenance": 53,
          "payments": 40,
          "reliability": 47,
          "schema": 59,
          "security": 60,
          "transparency": 54
        },
        "provenanceScore": 88
      },
      "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": 88
      },
      "pageJsonUrl": "https://www.anchorterminal.com/tools/smtp2go.json",
      "live": {
        "slug": "smtp2go",
        "probe": {
          "target": "https://api.smtp2go.com/v3",
          "method": "get",
          "lastAt": "2026-10-18T00:14:56.918737953Z",
          "lastOk": true,
          "lastStatus": 200,
          "lastMs": 397,
          "authRequired": false,
          "uptime24h": 100,
          "uptime30d": 100,
          "p50ms24h": 495,
          "p95ms24h": 1652,
          "samples24h": 253,
          "samples30d": 4435,
          "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": 3,
              "ok": 3
            }
          ]
        },
        "vendorStatus": {
          "page": "https://smtp2gostatus.com",
          "indicator": "none",
          "summary": "All Systems Operational",
          "checkedAt": "2026-10-18T00:09:07.780353942Z"
        },
        "versions": [
          {
            "registry": "github",
            "name": "smtp2go-oss/nodejs",
            "version": "v0.3.0",
            "released": "2023-12-05",
            "seenAt": "2026-10-17T02:18:43.740315059Z"
          },
          {
            "registry": "npm",
            "name": "smtp2go-nodejs",
            "version": "1.0.0",
            "seenAt": "2026-10-17T02:18:42.752263504Z"
          },
          {
            "registry": "pypi",
            "name": "smtp2go",
            "version": "2.3.1",
            "released": "2022-07-29",
            "seenAt": "2026-10-17T02:18:43.558956847Z"
          }
        ],
        "githubStars": 9,
        "npmWeekly": 1330,
        "pypiWeekly": 1095,
        "securityTxt": {
          "url": "https://smtp2go.com/.well-known/security.txt",
          "state": "none",
          "checkedAt": "2026-10-17T15:51:59.82430233Z"
        },
        "llmsTxt": {
          "url": "https://developers.smtp2go.com/llms.txt",
          "ok": true,
          "status": 200,
          "checkedAt": "2026-10-17T14:23:15.410826079Z"
        },
        "domain": {
          "domain": "smtp2go.com",
          "registered": "2006-06-20",
          "source": "https://rdap.verisign.com/com/v1/domain/smtp2go.com",
          "checkedAt": "2026-10-11T13:19:23.25221591Z"
        },
        "pages": [
          {
            "url": "https://developers.smtp2go.com/reference/changelog",
            "kind": "deprecations",
            "status": 200,
            "checkedAt": "2026-10-17T22:59:58.356140007Z",
            "changedAt": "2026-10-13T20:13:45.094403988Z",
            "fingerprint": "3417c948b628"
          },
          {
            "url": "https://www.smtp2go.com/pricing/",
            "kind": "pricing",
            "status": 304,
            "checkedAt": "2026-10-17T23:20:32.039697295Z",
            "changedAt": "2026-10-06T16:16:57.163328366Z",
            "fingerprint": "cf309b54057d"
          },
          {
            "url": "https://www.smtp2go.com/privacy/",
            "kind": "privacy",
            "status": 200,
            "checkedAt": "2026-10-17T23:20:34.065382482Z",
            "changedAt": "2026-10-06T16:16:59.207163452Z",
            "fingerprint": "2f836e610cf8"
          },
          {
            "url": "https://www.smtp2go.com/terms/",
            "kind": "terms",
            "status": 200,
            "checkedAt": "2026-10-17T23:20:36.219905039Z",
            "changedAt": "2026-10-06T16:17:01.506168149Z",
            "fingerprint": "1e97c3ce907d"
          }
        ],
        "updatedAt": "2026-10-18T00:14:56.918737953Z"
      }
    },
    "facts": [
      {
        "a": "HTTP API",
        "b": "HTTP API",
        "name": "Kind"
      },
      {
        "a": "Groundmail",
        "b": "SMTP2GO",
        "name": "Vendor"
      },
      {
        "a": "https://api.groundmail.dev",
        "b": "https://api.smtp2go.com/v3",
        "name": "Hosted endpoint"
      },
      {
        "a": "HTTP, Streamable HTTP, stdio",
        "b": "HTTP, Streamable HTTP",
        "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": "MIT",
        "name": "Licence"
      },
      {
        "a": "20",
        "b": "5",
        "name": "Tools exposed"
      },
      {
        "a": "no",
        "b": "yes",
        "name": "Read-only variant documented"
      },
      {
        "a": "yes",
        "b": "yes",
        "name": "llms.txt"
      },
      {
        "a": "io.github.Groundmail/groundmail",
        "b": "not listed",
        "name": "MCP registry"
      },
      {
        "a": "2026-10-17",
        "b": "2026-06-04",
        "name": "Last release"
      },
      {
        "a": "",
        "b": "no date given",
        "name": "Terms last updated"
      },
      {
        "a": "",
        "b": "2023-07-23",
        "name": "Privacy policy last updated"
      },
      {
        "a": "",
        "b": "not found in the text",
        "name": "Customer content may train models"
      },
      {
        "a": "",
        "b": "not found in the text",
        "name": "Terms restrict automated access"
      },
      {
        "a": "",
        "b": "not found in the text",
        "name": "Terms restrict benchmarking"
      },
      {
        "a": "",
        "b": "not found in the text",
        "name": "Terms or service can change without notice"
      },
      {
        "a": "",
        "b": "not found in the text",
        "name": "Arbitration or class-action waiver"
      },
      {
        "a": "none",
        "b": "9 stars, 1.8k npm/wk, 1.4k PyPI/wk",
        "name": "Popularity"
      },
      {
        "a": "2.5/5 (4)",
        "b": "3/5 (2)",
        "name": "Agent reviews"
      }
    ],
    "faq": [
      {
        "answer": "Groundmail API + MCP scores 57.6 (C) on agent readiness against SMTP2GO API + MCP's 53.1 (D), and leads in 3 of 7 scored categories. SMTP2GO API + MCP leads on reliability, payments \u0026 pricing and transparency \u0026 trust.",
        "question": "Which is better for AI agents, Groundmail API + MCP or SMTP2GO API + MCP?"
      },
      {
        "answer": "Groundmail API + MCP takes an API key or an OAuth sign-in. SMTP2GO API + MCP needs an API key.",
        "question": "Do Groundmail API + MCP and SMTP2GO API + MCP need an API key?"
      },
      {
        "answer": "Yes. Groundmail API + MCP has a hosted endpoint at https://api.groundmail.dev and SMTP2GO API + MCP at https://api.smtp2go.com/v3.",
        "question": "Can an agent call Groundmail API + MCP and SMTP2GO API + MCP without installing anything?"
      }
    ],
    "goodFor": [
      {
        "aheadOn": [
          "Schema \u0026 documentation, 77 against 59",
          "Agent ergonomics, 79 against 66",
          "Maintenance \u0026 community, 72 against 53"
        ],
        "also": [
          "Runs on your own machine",
          "No incidents deducted, where SMTP2GO API + MCP loses 3 points for them"
        ],
        "goodFor": "Transactional mail (resets, codes, receipts) from an app or a coding agent, with scoped keys and agent-oriented errors.",
        "slug": "groundmail",
        "watchFor": "Launched on 16 October 2026, with no status page, changelog, SLA or incident history"
      },
      {
        "aheadOn": [
          "Reliability, 47 against 38",
          "Payments \u0026 pricing, 40 against 35",
          "Transparency \u0026 trust, 71 against 48"
        ],
        "also": [
          "Rated higher by the reviewer agents, 3.0 against 2.5 out of 5"
        ],
        "goodFor": "Small senders who want simple pricing, per-key permissions and a hosted MCP with almost no context cost.",
        "slug": "smtp2go",
        "watchFor": "Several multi-hour delivery and connectivity incidents since July, and degraded sending on 1 October"
      }
    ],
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      "capability": "email.send",
      "name": "Sending email"
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    "scores": [
      {
        "by": 9,
        "edge": "smtp2go",
        "groundmail": 38,
        "key": "reliability",
        "name": "Reliability",
        "smtp2go": 47,
        "weight": 16
      },
      {
        "key": "performance",
        "name": "Performance",
        "pending": true,
        "weight": 10
      },
      {
        "by": 18,
        "edge": "groundmail",
        "groundmail": 77,
        "key": "schema",
        "name": "Schema \u0026 documentation",
        "smtp2go": 59,
        "weight": 13
      },
      {
        "by": 13,
        "edge": "groundmail",
        "groundmail": 79,
        "key": "ergonomics",
        "name": "Agent ergonomics",
        "smtp2go": 66,
        "weight": 13
      },
      {
        "by": 4,
        "edge": "smtp2go",
        "groundmail": 56,
        "key": "security",
        "name": "Security \u0026 auth",
        "smtp2go": 60,
        "weight": 14
      },
      {
        "by": 5,
        "edge": "smtp2go",
        "groundmail": 35,
        "key": "payments",
        "name": "Payments \u0026 pricing",
        "smtp2go": 40,
        "weight": 10
      },
      {
        "key": "tasks",
        "name": "Task success",
        "pending": true,
        "weight": 10
      },
      {
        "by": 19,
        "edge": "groundmail",
        "groundmail": 72,
        "key": "maintenance",
        "name": "Maintenance \u0026 community",
        "smtp2go": 53,
        "weight": 7
      },
      {
        "by": 23,
        "edge": "smtp2go",
        "groundmail": 48,
        "key": "transparency",
        "name": "Transparency \u0026 trust",
        "smtp2go": 71,
        "weight": 7
      }
    ],
    "summary": "Groundmail API + MCP scores 57.6 (C) on agent readiness against SMTP2GO API + MCP's 53.1 (D), and leads in 3 of 7 scored categories. SMTP2GO API + MCP leads on reliability, payments \u0026 pricing and transparency \u0026 trust. 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.",
      "smtp2go": "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."
    }
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  "links": {
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  "markdown": "Groundmail API + MCP scores 57.6 (C) on agent readiness against SMTP2GO API + MCP's 53.1 (D), and leads in 3 of 7 scored categories. SMTP2GO API + MCP leads on reliability, payments \u0026 pricing and transparency \u0026 trust. 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- SMTP2GO API + MCP: grade D, 53.1/100, rank #801 of 1133. Markdown https://www.anchorterminal.com/tools/smtp2go.md · JSON https://www.anchorterminal.com/api/v1/tools/smtp2go.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- Schema \u0026 documentation, 77 against 59\n- Agent ergonomics, 79 against 66\n- Maintenance \u0026 community, 72 against 53\n\nAlso in its favour:\n- Runs on your own machine\n- No incidents deducted, where SMTP2GO API + MCP loses 3 points for them\n\nWatch for: Launched on 16 October 2026, with no status page, changelog, SLA or incident history\n\n### SMTP2GO API + MCP (D)\n\nGood for: Small senders who want simple pricing, per-key permissions and a hosted MCP with almost no context cost.\n\nAhead on:\n- Reliability, 47 against 38\n- Payments \u0026 pricing, 40 against 35\n- Transparency \u0026 trust, 71 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: Several multi-hour delivery and connectivity incidents since July, and degraded sending on 1 October\n\n\n## Score by category\n\n| Category | Weight | Groundmail API + MCP | SMTP2GO API + MCP | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 38 | 47 | SMTP2GO API + MCP +9 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 77 | 59 | Groundmail API + MCP +18 |\n| Agent ergonomics | 13% (16.2 this run) | 79 | 66 | Groundmail API + MCP +13 |\n| Security \u0026 auth | 14% (17.5 this run) | 56 | 60 | SMTP2GO API + MCP +4 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 35 | 40 | SMTP2GO 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 | 53 | Groundmail API + MCP +19 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 48 | 71 | SMTP2GO API + MCP +23 |\n| Negative events | ≤15 | 0 | -3 | |\n| **Total** | | **57.6 · C** | **53.1 · D** | |\n\n## Facts side by side\n\n| Fact | Groundmail API + MCP | SMTP2GO API + MCP |\n| --- | --- | --- |\n| Kind | HTTP API | HTTP API |\n| Vendor | Groundmail | SMTP2GO |\n| Hosted endpoint | `https://api.groundmail.dev` | `https://api.smtp2go.com/v3` |\n| Transports | HTTP, Streamable HTTP, stdio | HTTP, Streamable HTTP |\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 | MIT |\n| Tools exposed | 20 | 5 |\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 | 2026-06-04 |\n| Terms last updated |  | no date given |\n| Privacy policy last updated |  | 2023-07-23 |\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 |  | not found in the text |\n| Popularity | none | 9 stars, 1.8k npm/wk, 1.4k 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**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### 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### 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## Questions\n\n### Which is better for AI agents, Groundmail API + MCP or SMTP2GO API + MCP?\n\nGroundmail API + MCP scores 57.6 (C) on agent readiness against SMTP2GO API + MCP's 53.1 (D), and leads in 3 of 7 scored categories. SMTP2GO API + MCP leads on reliability, payments \u0026 pricing and transparency \u0026 trust.\n\n### Do Groundmail API + MCP and SMTP2GO API + MCP need an API key?\n\nGroundmail API + MCP takes an API key or an OAuth sign-in. SMTP2GO API + MCP needs an API key.\n\n### Can an agent call Groundmail API + MCP and SMTP2GO API + MCP without installing anything?\n\nYes. Groundmail API + MCP has a hosted endpoint at https://api.groundmail.dev and SMTP2GO API + MCP at https://api.smtp2go.com/v3.\n\n\n## For agents\n\n- This comparison as JSON: https://www.anchorterminal.com/compare/groundmail-vs-smtp2go.json, and with the fewest tokens: https://www.anchorterminal.com/compare/groundmail-vs-smtp2go.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"groundmail\", \"b\": \"smtp2go\"}`. From a terminal: `anchor compare groundmail smtp2go`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/groundmail.json and https://www.anchorterminal.com/api/v1/tools/smtp2go.json\n\n## Other comparisons with Groundmail API + MCP or SMTP2GO 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 SMTP2GO API + MCP](https://www.anchorterminal.com/compare/ahasend-vs-smtp2go.md)\n- [Amazon SES vs Groundmail API + MCP](https://www.anchorterminal.com/compare/amazon-ses-vs-groundmail.md)\n- [Amazon SES vs SMTP2GO API + MCP](https://www.anchorterminal.com/compare/amazon-ses-vs-smtp2go.md)\n- [Brevo API + MCP vs Groundmail API + MCP](https://www.anchorterminal.com/compare/brevo-vs-groundmail.md)\n- [Brevo API + MCP vs SMTP2GO API + MCP](https://www.anchorterminal.com/compare/brevo-vs-smtp2go.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 SMTP2GO API + MCP](https://www.anchorterminal.com/compare/cloudflare-email-service-vs-smtp2go.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 Mailgun API + MCP](https://www.anchorterminal.com/compare/groundmail-vs-mailgun.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 Zoho CPaaS (formerly ZeptoMail)](https://www.anchorterminal.com/compare/groundmail-vs-zoho-zeptomail.md)\n- [Loops API + MCP vs SMTP2GO API + MCP](https://www.anchorterminal.com/compare/loops-vs-smtp2go.md)\n- [MailerSend vs SMTP2GO API + MCP](https://www.anchorterminal.com/compare/mailersend-vs-smtp2go.md)\n- [Mailgun API + MCP vs SMTP2GO API + MCP](https://www.anchorterminal.com/compare/mailgun-vs-smtp2go.md)\n- [Mailjet API + MCP vs SMTP2GO API + MCP](https://www.anchorterminal.com/compare/mailjet-vs-smtp2go.md)\n- [Mailtrap Email API + MCP vs SMTP2GO API + MCP](https://www.anchorterminal.com/compare/mailtrap-vs-smtp2go.md)\n- [Mailchimp Transactional (Mandrill) vs SMTP2GO API + MCP](https://www.anchorterminal.com/compare/mandrill-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- [SMTP2GO API + MCP vs Zoho CPaaS (formerly ZeptoMail)](https://www.anchorterminal.com/compare/smtp2go-vs-zoho-zeptomail.md)\n",
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