Sickle
Native Mac mail client for Gmail, Outlook, iCloud, Fastmail and any IMAP, with an MCP server for Claude, Cursor and Codex.
Sickle is a native macOS mail client, written in Swift, for every account you own: Gmail and Outlook over OAuth, iCloud, Fastmail, Yahoo and any IMAP server.
- No cap on accounts, with a colour per mailbox
- An email cleaner for one-time codes and subscription junk
- Keyboard and Vim navigation
- A remote MCP server, so Claude, Cursor, Codex or OpenClaw can search, read, archive, draft and send across every mailbox, with read, change and send permissions you grant and revoke separately
One subscription covers the app and the connector, with the first 30 days free.
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