Penguin Mail – open-source Rust email client for Linux with AI

Penguin Mail is a free, open-source email and calendar client for x86_64 Linux that consolidates Gmail, Microsoft accounts, and any IMAP/POP3/SMTP service into a single fast app. It offers a unified inbox or per-account inboxes, conversation view, Gmail-style category tabs (Primary, Updates, Promotions, Social), and features like send-later with undo, a promotions/sent-mail assistant pane, and a Hide My Email-like generator for disposable addresses. Calendars (Google, Microsoft, CalDAV) appear alongside mail with Day/Week/Month/Agenda views and RSVP capability; contacts sync from Google, Microsoft, or CardDAV and recipient suggestions appear as you type. Server-side rules from Gmail, Microsoft, or Sieve are shown in plain language with forms to add new ones. Encryption support uses the user’s GnuPG for OpenPGP and S/MIME without holding keys or passphrases.

The app keeps syncing from the system tray with unread counts and actionable notifications, and an optional AI assistant can run locally (LM Studio, Ollama) or be left off; it analyzes mailboxes to answer queries and asks permission before sending mail or changing settings. Released as version 1.0.0 under GPL‑3.0‑or‑later, Penguin Mail connects directly to provider APIs (no intermediary server), offers source code on GitHub, and is produced by Pivotd with a published privacy policy and support contact.