{
 "categories": [
  "email",
  "developer-tools"
 ],
 "deployment": "saas",
 "evidence": [
  {
   "date": "2026-09-27",
   "fact": "homepage",
   "note": "Postmark's MCP page presents Postmark as the transactional email product and points to the official server at https://github.com/ActiveCampaign/postmark-mcp.",
   "source": "https://postmarkapp.com/lp/mcp",
   "tier": "declared"
  },
  {
   "date": "2026-09-27",
   "fact": "license",
   "note": "The free plan is $0.00 per month and includes 100 emails per month with no overages. Basic is $15.00 per month from 10,000 emails.",
   "source": "https://postmarkapp.com/pricing",
   "tier": "declared"
  },
  {
   "date": "2026-09-27",
   "fact": "modalities.api.exists",
   "note": "Postmark documents an HTTP API at https://api.postmarkapp.com.",
   "source": "https://postmarkapp.com/developer/api/overview",
   "tier": "declared"
  },
  {
   "date": "2026-09-27",
   "fact": "modalities.api.kinds[0]",
   "note": "The overview documents HTTPS requests to the Postmark API and JSON error bodies.",
   "source": "https://postmarkapp.com/developer/api/overview",
   "tier": "declared"
  },
  {
   "date": "2026-09-27",
   "fact": "modalities.api.auth[0]",
   "note": "Server-level requests send the server API token in the X-Postmark-Server-Token header. POSTMARK_API_TEST in that header validates a request without sending.",
   "source": "https://postmarkapp.com/developer/api/overview",
   "tier": "declared"
  },
  {
   "date": "2026-09-27",
   "fact": "modalities.api.auth[1]",
   "note": "Account-level requests send X-Postmark-Account-Token. The account token is available to the account owner and account admins.",
   "source": "https://postmarkapp.com/developer/api/overview",
   "tier": "declared"
  },
  {
   "date": "2026-09-27",
   "fact": "modalities.api.coverage",
   "note": "The overview establishes authentication, the API host, and HTTP status codes. This pass did not open every endpoint page, so coverage stays partial.",
   "source": "https://postmarkapp.com/developer/api/overview",
   "tier": "declared"
  },
  {
   "date": "2026-09-27",
   "fact": "modalities.mcp.first_party",
   "note": "The ActiveCampaign README calls the repository the official Postmark MCP server. It documents 24 tools and the npm package @activecampaign/postmark-mcp.",
   "source": "https://github.com/ActiveCampaign/postmark-mcp",
   "tier": "declared"
  },
  {
   "date": "2026-09-27",
   "fact": "modalities.extensibility.webhooks",
   "note": "A Postmark webhook is an HTTP POST to the application when an event occurs. Postmark does not currently support HMAC signatures and recommends HTTPS plus HTTP Basic authentication.",
   "source": "https://postmarkapp.com/developer/webhooks/webhooks-overview",
   "tier": "declared"
  },
  {
   "date": "2026-09-27",
   "fact": "modalities.data_access.export[0]",
   "note": "The overview shows JSON error bodies, including ErrorCode and Message fields.",
   "source": "https://postmarkapp.com/developer/api/overview",
   "tier": "declared"
  },
  {
   "date": "2026-09-27",
   "fact": "modalities.data_access.import[0]",
   "note": "The overview describes malformed JSON as a cause of HTTP 422, so write requests use JSON bodies.",
   "source": "https://postmarkapp.com/developer/api/overview",
   "tier": "declared"
  },
  {
   "date": "2026-09-27",
   "fact": "modalities.agent_docs.llms_txt",
   "note": "Opened a Postmark documentation index covering authentication, the REST API, and webhooks.",
   "source": "https://postmarkapp.com/llms.txt",
   "tier": "declared"
  },
  {
   "date": "2026-09-27",
   "fact": "verdict.scores.api",
   "note": "The REST API authenticates with server and account tokens over HTTPS and returns JSON errors. Endpoint inventory beyond the overview was not opened, so the score stays below a fully catalogued API.",
   "source": "https://postmarkapp.com/developer/api/overview",
   "tier": "declared"
  },
  {
   "date": "2026-09-27",
   "fact": "verdict.scores.mcp",
   "note": "The official server is a local process with 24 tools for send, templates, search, diagnostics, bounces, suppressions, stats, and webhooks. It uses a server token rather than a hosted OAuth URL.",
   "source": "https://github.com/ActiveCampaign/postmark-mcp",
   "tier": "declared"
  },
  {
   "date": "2026-09-27",
   "fact": "freshness.watch[0].url",
   "note": "Opened the official Postmark MCP README, including the tool count and required environment variables.",
   "source": "https://github.com/ActiveCampaign/postmark-mcp",
   "tier": "declared"
  },
  {
   "date": "2026-09-27",
   "fact": "freshness.watch[1].url",
   "note": "Opened the Postmark API overview, including the host and both token headers.",
   "source": "https://postmarkapp.com/developer/api/overview",
   "tier": "declared"
  },
  {
   "date": "2026-09-27",
   "fact": "freshness.watch[2].url",
   "note": "Opened the Postmark webhooks overview, including the HTTP POST contract and the HMAC limitation.",
   "source": "https://postmarkapp.com/developer/webhooks/webhooks-overview",
   "tier": "declared"
  }
 ],
 "freshness": {
  "last_verified": "2026-09-27",
  "volatility": "high",
  "watch": [
   {
    "type": "docs",
    "url": "https://github.com/ActiveCampaign/postmark-mcp"
   },
   {
    "type": "docs",
    "url": "https://postmarkapp.com/developer/api/overview"
   },
   {
    "type": "docs",
    "url": "https://postmarkapp.com/developer/webhooks/webhooks-overview"
   }
  ]
 },
 "homepage": "https://postmarkapp.com/",
 "id": "postmark",
 "license": "freemium",
 "modalities": {
  "agent_docs": {
   "llms_txt": true
  },
  "api": {
   "auth": [
    "server-token",
    "account-token"
   ],
   "coverage": "partial",
   "docs": "https://postmarkapp.com/developer/api/overview",
   "exists": true,
   "kinds": [
    "rest"
   ]
  },
  "cli": {
   "exists": "unknown"
  },
  "computer_use": {
   "issues": [],
   "viability": "unknown"
  },
  "data_access": {
   "export": [
    "json"
   ],
   "import": [
    "json"
   ]
  },
  "extensibility": {
   "scripting": [],
   "webhooks": true
  },
  "integrations": {
   "make": "unknown",
   "n8n": "unknown",
   "power_automate": "unknown",
   "zapier": "unknown"
  },
  "mcp": {
   "first_party": true,
   "third_party": [],
   "verdict": "official"
  },
  "rpa": {
   "drivability": "unknown",
   "notes": "No repeatable UI probe was run. Sending, templates, and delivery events are documented as HTTP calls, and computer-use viability was not measured.\n",
   "ui_stack": [],
   "vendor_support": []
  },
  "sdk": {
   "exists": "unknown",
   "languages": [],
   "official": "unknown"
  }
 },
 "name": "Postmark",
 "platforms": [
  "web"
 ],
 "related": {
  "alternatives": [
   "resend",
   "mailchimp",
   "activecampaign"
  ],
  "our_products": []
 },
 "schema_version": 1,
 "score_version": 1,
 "status": "active",
 "vendor": "ActiveCampaign",
 "verdict": {
  "best_path": "api",
  "scores": {
   "api": 8,
   "cli": null,
   "computer_use": null,
   "integrations": null,
   "mcp": 7,
   "overall": 8,
   "rpa": null
  },
  "summary": "Postmark is automatable today through its REST API. This record is Postmark transactional email. ActiveCampaign marketing automation, Mailchimp, and Resend are separate products. API requests use HTTPS at https://api.postmarkapp.com. Server-level calls send X-Postmark-Server-Token. Account-level calls send X-Postmark-Account-Token. POSTMARK_API_TEST in the server-token header validates a send without delivering mail. Error bodies are JSON, and a bad token returns HTTP 401. Postmark webhooks are HTTP POST requests to the application's URL when an event occurs. Postmark does not currently support HMAC webhook signatures; the docs recommend HTTPS and HTTP Basic authentication in the webhook URL. The official MCP server is the ActiveCampaign repository postmark-mcp, installed locally and published as @activecampaign/postmark-mcp. It exposes 24 tools for sending, templates, message search, diagnostics, bounces, suppressions, stats, server info, and webhooks. Configuration uses POSTMARK_SERVER_TOKEN, DEFAULT_SENDER_EMAIL, and DEFAULT_MESSAGE_STREAM. It is not a vendor-hosted remote MCP URL. Official SDK languages and a management CLI were not opened. Connector catalogs were not opened. The free plan is $0 per month for 100 emails. Basic starts at $15 per month. https://postmarkapp.com/llms.txt is a documentation index. Computer-use viability is unassessed. The API scores 8 and is the best path. The local MCP server scores 7.\n"
 }
}