Penguin Mail is a free, open-source email client for x86_64 Linux, built with Rust and released under GPL-3.0-or-later. It unifies Gmail, Microsoft, IMAP, and POP3 accounts into a single inbox with calendar, contacts, and tray syncing. Users can sign in to Gmail, Outlook.com, Hotmail, Microsoft 365, Fastmail, iCloud, Yahoo, or any IMAP/POP3 server; Penguin Mail auto-detects settings from the address. The app supports light and dark themes, system tray notifications, and unread counts.
Calendar views include Day, Week, Month, and Agenda for Google, Microsoft, and CalDAV providers. Contacts are pulled from Google, Microsoft, or CardDAV, with smart suggestions as you type. Security features include OpenPGP and S/MIME via GnuPG, with no server-side key handling. Rules support Gmail filters, Microsoft inbox rules, and Sieve, all editable through a plain-language form.
An optional AI assistant runs locally via LM Studio or Ollama, asking permission before sending mail or changing settings. It can query mailboxes (e.g., unanswered sent mail) and show tool usage. Inbox sorting mimics Gmail’s Primary, Updates, Promotions, and Social categories. Users can schedule sends, undo messages, and use Hide My Email for disposable Gmail addresses. All data stays local—no tracking, no ads. A two-minute YouTube tour is available.
Source: Hacker News · Summarized by HeadlinesBriefing