MinuteMail MCP Server

MinuteMail as MCP (Model Context Protocol) tools: let AI agents and MCP clients operate ephemeral mailboxes, emails, attachments, custom domains, teams, and mock OAuth identities for testing email and auth flows.

• Endpoint: https://mcp.minutemail.co/mcp (Streamable HTTP, protocol revision 2025-06-18)
• Auth: your MinuteMail API key (Bearer mmak_...). The server is a stateless proxy — it holds no credentials, sessions, or local storage of its own; your key is forwarded verbatim to the MinuteMail API, where scopes and quotas are enforced. All state (mailboxes, mails, identities) lives in the MinuteMail platform behind it.
• Also listed in the official MCP Registry as io.github.minutemailco/mcp-server and on Smithery.

Get an API key

1. Sign up at minutemail.co (free during early access)

2. Create an API key in the dashboard

3. Configure your MCP client to send it as the Authorization header:

   Authorization: Bearer mmak_XXXXXXXX

Connect your MCP client

Claude Code / Claude Desktop / Cursor / any Streamable HTTP client:

• URL: https://mcp.minutemail.co/mcp
• Header: Authorization: Bearer mmak_...

Claude Code CLI:

claude mcp add --transport http minutemail https://mcp.minutemail.co/mcp \
  --header "Authorization: Bearer mmak_XXXXXXXX"

Claude Desktop / clients with an mcpServers JSON config (e.g. claude_desktop_config.json / ~/.cursor/mcp.json):

{
  "mcpServers": {
    "minutemail": {
      "type": "http",
      "url": "https://mcp.minutemail.co/mcp",
      "headers": {
        "Authorization": "Bearer mmak_XXXXXXXX"
      }
    }
  }
}

Some clients (older Claude Desktop builds) only support local stdio servers in their JSON config. If yours rejects type: "http", use the built-in remote/connectors UI with the URL and header above, or run mcp-remote as a stdio bridge:

{
  "mcpServers": {
    "minutemail": {
      "command": "npx",
      "args": [
        "mcp-remote",
        "https://mcp.minutemail.co/mcp",
        "--header",
        "Authorization: Bearer mmak_XXXXXXXX"
      ]
    }
  }
}

For a guided walkthrough, see the docs: docs.minutemail.co/mcp/getting-started.

Raw JSON-RPC (what the clients do under the hood):

curl -s https://mcp.minutemail.co/mcp \
  -H 'Authorization: Bearer mmak_XXXXXXXX' \
  -H 'Content-Type: application/json' \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/call",
       "params":{"name":"mailboxes.create","arguments":{"expiresIn":30}}}'

Tools (39)

Every tool maps 1:1 to a route of the MinuteMail API. All calls require the Bearer API key; write operations require the matching scope (mailboxes, domains, team, identities).

Mailboxes (mailboxes scope)

Archived mailboxes (mailboxes scope)

archived.list, archived.get, archived.delete, archived.reactivate.

Custom domains (domains scope)

domains.list, domains.register, domains.verify, domains.delete.

Team (team scope)

team.members.list, team.members.add, team.members.get, team.members.delete, team.invitations.create, team.invitations.list, team.invitations.delete.

Mock identities & OAuth clients (identities scope)

identities.list, identities.create, identities.update, identities.get, identities.delete, oauth.clients.list, oauth.clients.create, oauth.clients.get, oauth.clients.delete, oauth.clients.rotate_secret. identities.update patches profile fields, isActive (activate/deactivate), emailVerified (drives the email_verified claim), and custom claims merged into issued ID tokens and userinfo responses.

Tool results are returned as MCP text content carrying the API's JSON response. Non-2xx responses become isError: true results with the HTTP status and body (401 invalid key, 403 scope/domain, 429 quota with remaining count, 502 upstream down).

Typical agent workflow

mailboxes.create (expiresIn 30)
        ↓
your app under test sends a verification email to the mailbox address
        ↓
mails.list → mails.get (extract the code / link)
        ↓
assert the flow completed — the mailbox expires on its own

Self-hosting

The server is a single static Go binary in a scratch image (~7 MB):

docker run -p 8080:8080 \
  -e API_BASE=https://api.minutemail.co \
  ghcr.io/minutemailco/mcp-server:latest
# or from Docker Hub:
docker run -p 8080:8080 \
  -e API_BASE=https://api.minutemail.co \
  chrptvn/minutemail-mcp:latest

Self-hosting still requires MinuteMail API keys — the server is a stateless proxy over the hosted API, not a standalone implementation. It keeps no sessions or local data; every mailbox, mail, and identity is stored by the MinuteMail API it forwards to.

GET /health for liveness; GET /metrics for Prometheus counters. API-key management is not exposed via MCP — manage keys from the web app.

Development

Go 1.23, stdlib plus prometheus/client_golang.

go test ./...     # unit tests
go vet ./...
go run .          # local server on :8080

License

MIT — © MinuteMail.co