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Postmark MCP Server

Yes. Postmark has an official MCP server, hosted at github.com/ActiveCampaign/postmark-mcp.

OFFICIAL MCP✓ alivePublic API
Open MCP pageTry Postmark
MCP status verified 2026-05-21Agent-readiness 6/10
Data from Buddy's database, auto-rechecked weekly

What is the Postmark MCP server?

The Postmark MCP server lets Claude, Cursor, Codex, and other MCP-compatible clients query campaigns, contacts, segments, and automation workflows without leaving the editor. The server is official, hosted by Postmark themselves, so it should track product changes without lag.

Three things you actually do with it: ask Claude which segments are growing fastest this quarter, have Cursor draft a 3-step welcome series for new ebook signups, and let Codex re-engage cold subscribers with personalised subject lines.

Postmark also has a public REST API at developer.postmarkapp.com. Use the API for scheduled jobs and custom dashboards. Use the MCP server when an LLM is in the loop.

For the rest of the picture see the full coverage on this tool..

Live in your Claude / Cursor / Codex

What you actually do with the Postmark MCP

postmark-mcplive
>What's the open rate on my last 5 campaigns?
●postmark.list_campaigns({ limit: 5 })
LAST 5 CAMPAIGNS · OPEN RATE
Black Friday Teaser42.1%
Product launch38.5%
Weekly digest #1227.0%
Welcome flow step 261.3%
Re-engagement attempt9.8%
Suggest A/B subject lines for the bottom two?
postmark-mcplive
>Build a 3-email welcome series for new ebook subscribers
●postmark.create_automation({ trigger: "list_added" })
AUTOMATION CREATED · 3 EMAILS
Day 0ebook delivery + intro
Day 2case study + soft CTA
Day 5product demo + 14-day trial
Review drafts before activation?
postmark-mcplive
>Which segments are growing fastest this quarter?
●postmark.segment_growth({ period: "Q4" })
TOP 3 GROWING SEGMENTS
Trial → Paid converters+187%
EU subscribers+62%
Re-engaged churned+34%
TMB SCORE FOR PostmarkMCP: OfficialAgent fit: 6/10
Read review →

Examples illustrative. Actual responses depend on your data and the Postmark MCP server's tool surface.

How to connect Postmark MCP to Claude Desktop

Add this block to ~/Library/Application Support/Claude/claude_desktop_config.json (macOS) or %APPDATA%\Claude\claude_desktop_config.json (Windows), then restart Claude Desktop. Cursor and Codex use a similar schema.

{
  "mcpServers": {
    "postmark": {
      "command": "npx",
      "args": ["-y", "<server-package-name>"],
      "env": {
        "POSTMARK_API_KEY": "your-api-key-here"
      }
    }
  }
}
// Server source: https://github.com/ActiveCampaign/postmark-mcp
// Check the server's README for the exact "command" and required env vars.

Some MCP servers require an API key. Check the source page for setup: github.com/ActiveCampaign/postmark-mcp.

Does Postmark MCP cost extra?

Included with subscription

Postmark ships an official MCP server that uses your existing subscription credentials.

  • No separate MCP licence to buy. You pay for your Postmark plan, the MCP server queries that account.
  • Whether it's gated to a specific tier wasn't extracted automatically — verify the access requirements on the MCP page or pricing docs.

Postmark also publishes a REST API

Postmark publishes an API, but per-tier gating wasn't extracted automatically.

Auth method
—
SDK languages
—
OpenAPI spec
—
Webhooks
—
Structured outputs
—
See Postmark API page

What you can do with Postmark from an AI agent

Three shapes of agent workflow. Pick the row that matches how you actually use Claude / Cursor / Codex day to day.

INDIE / SOLO

Skip the dashboard, ask Claude

  • "What campaigns underperformed this week?" answered in seconds
  • Quick one-off questions without leaving the editor
  • Pipe Postmark data into your personal notes / docs without writing a script
Effort: 30 seconds — paste the config, restart Claude
AGENCY

Run client analysis at agent speed

  • Hand the MCP server to your team — every consultant can ask Claude about any client's Postmark account
  • Multi-account workflows without context-switching the Postmark UI
  • Reports you'd normally spend hours on, done before standup
Effort: An afternoon — set up auth per client
IN-HOUSE TEAM

Production agent workflows

  • Embed in your internal Codex / Cursor agents that triage Postmark data daily
  • Combine with other MCP servers in a multi-step agent chain
  • Constrain agents to read-only roles to keep production Postmark safe
Effort: Days — security review + role config

Limits and gotchas

  • Official MCP server — published by Postmark themselves, so it should track product changes.
  • Fallback: the REST API works for any flow the MCP server doesn't cover.
  • Rate limits: MCP calls count against your underlying Postmark API quota. Burst usage from a curious agent can drain a daily allowance fast.
6/10

Agent-readiness verdict

Moderate agent-fit with official MCP support. Postmark has an official MCP server and documented public API, making it accessible to agent workflows, but lacks OpenAPI specs and SDKs that would streamline integration. Missing structured outputs and native Claude integration means you'll need custom parsing for agent responses.

MCP server availableOfficial MCP (on tool's own domain)Public API with docs

Scored 2026-05-21 by Joonas (TMB).

Postmark MCP & API FAQ

Is the Postmark MCP server official?+
Yes — published on Postmark's own domain at https://github.com/ActiveCampaign/postmark-mcp.
Can I use the Postmark MCP with Cursor or Codex?+
Yes — MCP is a protocol, not Claude-specific. Any MCP-capable client (Cursor, Codex, Windsurf, Zed) can use the same server config with minor path adjustments.
Does Postmark have a public API?+
Yes — public REST API at developer.postmarkapp.com.

Sources

Data verified by Joonas on the dates shown. MCP server status auto-rechecked weekly.