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Postmark

Postmark

Send transactional email from an AI agent — verified deliverability, audit-friendly.

Score 75(?)Postmark (ActiveCampaign)MIT54Verified Top MCPs for Email →
InstallView on GitHub

Quick answer

What it does

Wraps the Postmark REST API: send a transactional email, query message status, search the message stream, fetch bounce details, list servers and templates.

Best for

  • Transactional email from agents
  • Customer notifications
  • Internal alert routing
  • Bounce and complaint triage

Not for

  • Marketing campaigns
  • Cold outreach

Source: top-mcps.com/mcp/postmark — verified Aug 2026

Setup recipe

Pick your client, then follow the three steps.

  1. 1

    Install

    claude_desktop_config.json
    {
  "mcpServers": {
    "postmark": {
      "command": "npx",
      "args": [
        "-y",
        "@activecampaign/postmark-mcp"
      ],
      "env": {
        "POSTMARK_SERVER_TOKEN": "${POSTMARK_SERVER_TOKEN}",
        "POSTMARK_FROM": "${POSTMARK_FROM}"
      }
    }
  }
}

    Paste under mcpServers. Fully quit and reopen Claude after editing.

    CLI or .mcp.json
    # export POSTMARK_SERVER_TOKEN=changeme
# export POSTMARK_FROM=agent@example.com
claude mcp add postmark -- npx -y @activecampaign/postmark-mcp

    Run from your repo. Commit .mcp.json to share with your team.

    .cursor/mcp.json
    {
  "mcpServers": {
    "postmark": {
      "command": "npx",
      "args": [
        "-y",
        "@activecampaign/postmark-mcp"
      ],
      "env": {
        "POSTMARK_SERVER_TOKEN": "${POSTMARK_SERVER_TOKEN}",
        "POSTMARK_FROM": "${POSTMARK_FROM}"
      }
    }
  }
}

    Global path: ~/.cursor/mcp.json. Reload window after editing.

    .vscode/mcp.json
    {
  "servers": {
    "postmark": {
      "command": "npx",
      "args": [
        "-y",
        "@activecampaign/postmark-mcp"
      ],
      "env": {
        "POSTMARK_SERVER_TOKEN": "${POSTMARK_SERVER_TOKEN}",
        "POSTMARK_FROM": "${POSTMARK_FROM}"
      }
    }
  }
}

    VS Code uses the "servers" key (not "mcpServers").

    ~/.codeium/windsurf/mcp_config.json
    {
  "mcpServers": {
    "postmark": {
      "command": "npx",
      "args": [
        "-y",
        "@activecampaign/postmark-mcp"
      ],
      "env": {
        "POSTMARK_SERVER_TOKEN": "${POSTMARK_SERVER_TOKEN}",
        "POSTMARK_FROM": "${POSTMARK_FROM}"
      }
    }
  }
}

    Open via Cascade → hammer icon → Configure.

    cline_mcp_settings.json
    {
  "mcpServers": {
    "postmark": {
      "command": "npx",
      "args": [
        "-y",
        "@activecampaign/postmark-mcp"
      ],
      "env": {
        "POSTMARK_SERVER_TOKEN": "${POSTMARK_SERVER_TOKEN}",
        "POSTMARK_FROM": "${POSTMARK_FROM}"
      }
    }
  }
}

    Open via the Cline sidebar → MCP Servers → Edit.

    ~/.continue/config.json
    {
  "experimental": {
    "modelContextProtocolServers": [
      {
        "transport": {
          "type": "stdio",
          "command": "npx",
          "args": [
            "-y",
            "@activecampaign/postmark-mcp"
          ],
          "env": {
            "POSTMARK_SERVER_TOKEN": "${POSTMARK_SERVER_TOKEN}",
            "POSTMARK_FROM": "${POSTMARK_FROM}"
          }
        }
      }
    ]
  }
}

    Continue uses modelContextProtocolServers with a transport block.

    ~/.codex/config.toml
    # ~/.codex/config.toml
[mcp_servers.postmark]
command = "npx"
args = [
  "-y",
  "@activecampaign/postmark-mcp",
]
env = { POSTMARK_SERVER_TOKEN = "${POSTMARK_SERVER_TOKEN}", POSTMARK_FROM = "${POSTMARK_FROM}" }

    Codex uses TOML. Each server is a [mcp_servers.<name>] subtable.

    ~/.config/zed/settings.json
    {
  "context_servers": {
    "postmark": {
      "command": {
        "path": "npx",
        "args": [
          "-y",
          "@activecampaign/postmark-mcp"
        ]
      },
      "env": {
        "POSTMARK_SERVER_TOKEN": "${POSTMARK_SERVER_TOKEN}",
        "POSTMARK_FROM": "${POSTMARK_FROM}"
      }
    }
  }
}

    Zed calls them "context_servers". Settings live-reload on save.

    ChatGPT → Apps directory

    Postmark doesn't ship a hosted HTTPS endpoint today. ChatGPT supports remote MCP servers only — to use this server in ChatGPT you'll need to deploy it to a public HTTPS URL first (e.g. via Cloudflare Workers or Vercel) or wait for an official remote build.

  2. 2

    Set required secrets

    Set POSTMARK_SERVER_TOKEN, POSTMARK_FROM in your shell environment before launching your MCP client.

  3. 3

    Try a minimum working prompt

    Minimum working prompt pending verification. Try any prompt from the MCP’s README once installed.

Tools & permissions

ToolDescriptionArgsSide effects
send_emailSend a transactional email.to: string, subject: string, body: stringWrite
send_templateSend a templated transactional email.template_id: string, to: string, model: objectWrite
get_messageLook up a sent message by ID.message_id: stringRead
search_messagesSearch the message stream by recipient, status, or tag.query: objectRead

Security & scope

Access scope
Read + write
Sandbox
Authenticates with a Postmark server token scoped to one logical send domain. The MCP exposes message-send and read-stream tools; rate-limited per token.
Gotchas
  • Server tokens can send email — treat them as production secrets and rotate on team changes.
  • POSTMARK_FROM must match a verified sender signature in the Postmark account, or sends 422.
  • Agent-drafted email can still hallucinate addresses — gate the send tool through a human approval step for high-blast-radius flows.

Agent prompt pack

— copy into Claude, Cursor, or ChatGPT.
Paste into Claude, Cursor, or ChatGPT. Edit the [brackets] before sending.
Recommend the best MCP servers for [task: e.g. email work] in [client: Claude].

Constraints:
- Prefer tools that are [official | open-source | read-only] — pick what matters for my use case.
- Exclude MCPs that require [e.g. a paid plan, OAuth-only flows, remote-only transport].
- Return at most 3 picks, ranked.

For each pick include:
1. One-sentence rationale.
2. The ready-to-paste install snippet for my client.
3. Any required secrets I need to create before installing.

Cross-check the top-mcps.com listing: https://top-mcps.com/top-mcps-for-email
Compare Postmark against a real alternative. Swap the second MCP in [brackets] if you want a different match.
Compare Postmark MCP vs [Resend MCP] for the following job: [describe the job, e.g. "let an agent create GitHub issues on bug triage"].

Judge them on:
- Setup time and complexity (what a new user hits first).
- Auth model (none / API key / OAuth 2.1) and credential risk.
- Transport (stdio / Streamable HTTP / SSE) and where the server runs.
- Required secrets and the blast radius if they leak.
- Operational risk in an unattended agent loop.
- Which one is "good enough" for a weekend prototype vs. production.

End with one sentence: which should I pick for my scenario, which is: [my scenario].

References:
- https://top-mcps.com/mcp/postmark
- top-mcps.com listing for Resend
Asks the agent to install and verify. Works inside Claude Code, Cursor Agent, Codex CLI.
Install the Postmark MCP server for my [client: Claude] at the default config path for that client.

Use the exact install snippet published at https://top-mcps.com/mcp/postmark (fetch https://top-mcps.com/mcp/postmark.json for the canonical server.json if you can read URLs).

Before finishing:
1. Create the required secrets (POSTMARK_SERVER_TOKEN, POSTMARK_FROM) and put them in the appropriate env block — do not hard-code them.
2. Restart or reload the client so it picks up the new server.
3. Verify the server is connected (green / running state) and at least one tool is listed.
4. If anything fails, read the client's MCP logs and report the exact error — do not silently retry.

Confirm when done and list the tools the server now exposes.

Frequently asked questions

What changed

— 2 updates tracked.

  1. v2.0.0 released — v2.0.0 — Expand to 24 tools + raw-HTTP convergence

  2. v1.0.0 released

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Compared with Postmark

Side-by-side breakdowns for the choices people most often weigh against this MCP.

PostmarkvsResendPostmarkvsMailgunPostmarkvsGmailPostmarkvsSendGrid

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