Sickle

Sickle

Every mailbox you own, in one Mac app and your AI agent

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Sickle is a native Mac mail client for every account you own: Gmail, Outlook, iCloud, Fastmail, Yahoo and any IMAP server, in one window, each in its own colour, with keyboard navigation and an email cleaner. It also runs a remote MCP server, so Claude, Cursor, Codex or any MCP client can search, tidy and draft across all of those mailboxes at once.

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