Postern ENPTES
Early preview. Nothing to download yet. PGP is still being built.

One email app for all your accounts.

Smart AI for any email provider. Free, open source, with PGP encryption.

  • Any email provider

    Your own domain, iCloud, Fastmail, a company server. Anything that speaks IMAP.

  • Smart AI

    Summaries, the mail that needs you picked out, replies in your own voice. Mail goes out when you press Send, or through an MCP tool you turn on yourself.

  • PGP

    Encrypt, sign and read encrypted mail in the app. Coming.

Free, with every feature. The code will be open, and the AI can run on your own Mac.

Where does my mail go?

Your mail stays on your mail server and on your Mac, unless you pick a cloud model such as your own Claude or ChatGPT. Then each request sends that provider only the messages it needs.

In this preview, reply drafts start on Claude; you can switch them to a model on your Mac. They can also look up public web pages, and a lookup can carry a few words from the mail.

A paid Cloud plan, our hosted model for Macs that can't run one, is planned.