This is a Model Context Protocol (MCP) server that exposes the Fastmail API via JMAP, enabling AI assistants to interact with email, contacts, and calendar data. The server supports core email operations such as listing mailboxes and mailbox statistics, listing and searching emails, retrieving full email content by ID, sending emails with proper draft/sent handling, and basic email management (marking read/unread, deleting, and moving between folders). Advanced capabilities include attachment handling (listing and downloading attachments), thread retrieval for complete conversations, and powerful multi-criteria search with support for bulk operations and analytics. Contacts and calendar tooling allow listing, retrieving, and searching contacts, as well as listing calendars/events, retrieving specific events, and creating new events with details and participants. Identity management and account statistics are also exposed. Authentication uses bearer tokens against Fastmail’s API, with setup instructions for API tokens and environment configuration. The server is built with Node.js 18+ and includes setup, development, and deployment options (including running via npm or npx and packaging for Claude Desktop Extensions).