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Langmail is an email and calendar backend that an agent can fully operate — and that isn’t owned by a hyperscaler. Your mailbox lives on Langmail’s own mail server, speaks open protocols, and exposes one MCP server that any MCP client supporting remote servers and OAuth can connect to. It has two layers:
  • The data layer — your mailbox and calendars on mail.langmail.me, reachable over JMAP, CalDAV, IMAP, and SMTP. Open protocols mean you can take your data and leave, any time, with standard tools.
  • The action layer — the Langmail MCP server at https://mcp.langmail.me/mcp. It gives your agent structured search over your mail, full message and thread reads, and complete calendar management, in compact responses designed for agent context windows.
Humans and agents share the same mailbox: you read your mail in webmail or any IMAP client, while your agent works on the same messages over MCP.

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Start here

Quickstart

Connect Claude Code to your mailbox and make your first tool call in about two minutes.

Connect your agent

Wire the Langmail MCP server into Claude Code, Claude Desktop, Cursor, or any MCP client.

MCP tool reference

All 10 tools with exact parameters, constraints, and example output.

Open protocols

JMAP, CalDAV, IMAP, and SMTP endpoints — the right to leave, documented.

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What the MCP server can do today

AreaTools
Search and read emailsearch_emails, get_email, get_thread
Manage calendarslist_calendars, create_calendar
Manage eventslist_calendar_events, create_calendar_event, update_calendar_event, delete_calendar_event
Respond to invitationsrespond_to_event
Email access is read-only by design: the current tool surface searches and reads mail but does not send, draft, or delete it. Calendar tools are read-write, including sending invitations and cancellations to attendees.

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Why builders pick Langmail

  • Built for agents first. Compact, plain-text tool results keep token spend low. Structured filters (category, sender, date range, mailbox) mean one precise call instead of paging through an inbox.
  • OAuth, not your password. Each MCP client connects through an OAuth grant you approve in the browser. Your agent never sees or stores your password.
  • Sovereign by construction. Your mail lives on Langmail’s own server on European infrastructure — not on a hyperscaler, and never used as training signal. See Sovereignty.