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. It has keyboard navigation and an email cleaner that finds every mailing list you never open.
It also runs a remote MCP server, so Claude, Cursor, Codex or any MCP client can work across all of those mailboxes at once. Ask "what needs a reply this morning?" and your agent reads every inbox and puts the urgent ones first. It can search, tidy, draft replies, and send when you ask.
You stay in control. Each tool has its own permission in your AI app, so reading, tidying and sending are allowed separately. Nothing is ever deleted for good, and Sickle keeps no copy of your mail. The connector works from any OS, so no Mac is needed for the agent side.
£8.99/month after a 7-day free trial, or £30/year. One subscription covers the app and the connector.
