Assistantmail MCP Server

assistantmail-mcp

MCP server for AssistantMail — give AI agents a managed mailbox to send and receive email.

Built for personal and small-team OpenClaw / Hermes operators who want agent email with allowlist, consent, retention, and spend caps you control. Listed on ClawHub for easy install — not an official OpenClaw endorsement.

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OpenClaw / ClawHub

openclaw skills install @assistantmail/assistant-mail

Then configure your MCP client to run this server and set ASSISTANT_MAIL_API_KEY (Claude Desktop and Cursor examples below). Skill: assistant-mail on ClawHub. Same MCP works with Hermes.

Installation

npx -y @assistantmail/assistantmail-mcp

Node 24+.

Claude Desktop

{
  "mcpServers": {
    "assistantmail": {
      "command": "npx",
      "args": ["-y", "@assistantmail/assistantmail-mcp"],
      "env": {
        "ASSISTANT_MAIL_API_KEY": "amk_..."
      }
    }
  }
}

Cursor / VS Code (.cursor/mcp.json or .vscode/mcp.json)

{
  "servers": {
    "assistantmail": {
      "command": "npx",
      "args": ["-y", "@assistantmail/assistantmail-mcp"],
      "env": {
        "ASSISTANT_MAIL_API_KEY": "amk_..."
      }
    }
  }
}

Prerequisites

1. Create a free account via the Get Free link above (1 agent, 25/day; current limits: Docs).
2. Go to API Keys and create a key (amk_...). Copy it immediately — it is only shown once.
3. Set ASSISTANT_MAIL_API_KEY; call assistantmail_list_mailboxes to get your mailboxId UUID. Mail API routes use that UUID, not an email address.

Paid plans: upgrade in-app only (not Payment Links). Use Upgrade in the AssistantMail app — checkout is not sold via Stripe Payment Links. Docs: assistant-mail.ai/docs

Official MCP Registry

The listing is live as io.github.AssistantMail/assistantmail-mcp on the Official MCP Registry. Product docs: assistant-mail.ai/docs.

Packaging lives in server.json. After a version bump, republish with mcp-publisher — see docs/MCP_REGISTRY.md.

Environment variables

Tools

Diagnostics

Account

Mailboxes

Messages

Recipients

Reference tools

These return raw REST endpoint details rather than calling the API. Use them when you need to construct a request manually or inspect the exact URL and response schema.

Quick start

API_KEY="amk_..."
BASE="https://api.assistant-mail.ai"

# 1) Discover your mailboxId
curl "$BASE/v1/mailboxes" -H "x-api-key: $API_KEY"

# 2) Send an email
curl -X POST "$BASE/v1/mailboxes/<mailboxId>/messages" \
  -H "x-api-key: $API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"to":"recipient@example.com","subject":"Hello","text":"Hi there"}'

# 3) Read inbox
curl "$BASE/v1/mailboxes/<mailboxId>/messages" -H "x-api-key: $API_KEY"

Tool call examples

{ "tool": "assistantmail_list_mailboxes", "input": { "apiKey": "amk_..." } }

{
  "tool": "assistantmail_list_messages",
  "input": { "mailboxId": "<uuid>", "limit": 20, "since": "2026-01-01T00:00:00.000Z" }
}

{
  "tool": "assistantmail_get_message",
  "input": { "mailboxId": "<uuid>", "messageId": "<uuid>" }
}

{
  "tool": "assistantmail_send_email",
  "input": {
    "mailboxId": "<uuid>",
    "to": "recipient@example.com",
    "subject": "Hello",
    "text": "Hi there"
  }
}

{
  "tool": "assistantmail_reply_message",
  "input": {
    "mailboxId": "<uuid>",
    "messageId": "<uuid>",
    "text": "Thanks for the update."
  }
}

If ASSISTANT_MAIL_API_KEY is set in the server environment, apiKey can be omitted from all tool inputs.

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