Sickle

Sickle's remote MCP server connects every mailbox you own to Claude, Claude Code, Cursor, Codex, or any MCP client. It supports Gmail and Outlook via OAuth, iCloud, Fastmail, Yahoo, and any IMAP server all at once. It offers twelve tools to list, search, read, mark, move, trash, draft, and send emails. OAuth uses separate read, change, and send scopes that can be revoked per client, and clients ask before each send. It works on macOS, Windows, or Linux with nothing to install. The server works alongside Sickle, a native Mac mail client for the same accounts. One subscription covers both, with a 30-day free trial.