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.

Sickle now runs a remote MCP server, so Claude, Cursor, Codex or any MCP client can work across every mailbox you have 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 and send. Each tool has its own permission in your AI app, sending asks before every email, nothing is deleted for good, and Sickle keeps no copy of your mail. Works from any OS.

Hi Product Hunt, I'm Nick, and I'm building Sickle solo.

I have five email accounts across Gmail, Fastmail, Outlook and a work IMAP server, and no single app showed me all of them the way I wanted. When I started using Claude for everything else, email was the one place it couldn't help: most connectors only see one account.

So Sickle is two things on one subscription: a native Mac app for every account, and an MCP server that hands those same mailboxes to your AI agent.

The agent side is built on one idea: email is untrusted input. Anyone can put text in your inbox, so an agent that reads it shouldn't be able to act freely. Each tool has its own permission in your AI app, and sending asks before every email. Nothing gets deleted for good, and Sickle keeps no copy of your mail.

What it doesn't do yet: there's no Windows or iOS app (the connector works from any OS), and no calendar.

The first 100 people get their first paid month free (sickle.app/claim), on top of the 7-day trial.

What's the first thing you'd ask an agent to do in your inbox?