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

Penguin Mail is an open-source Rust email client for Linux users. The application, version 1.0.0, provides a fast and secure way to manage Gmail, Microsoft, and other IMAP or POP3 accounts, along with calendars and contacts, all on a user's own computer. Users can input their account information to let Penguin Mail automatically discover the necessary server settings.

The application displays all accounts in a single inbox or allows users to manage them individually. Users can switch between Day, Week, Month, and Agenda views for each calendar, pulling information from Google, Microsoft, or CalDAV-compatible providers. Penguin Mail also offers features such as answering invitations, accessing contacts, and applying Gmail filters, Microsoft inbox rules, and Sieve rules for email organization.

GnuPG encryption ensures that users can securely sign and encrypt their emails without Penguin Mail ever holding their encryption keys or asking for a passphrase. Users have the option to run the app on their computer using LM Studio or Ollama, and Penguin Mail asks for permission before sending mail or making changes to settings.

The application sorts incoming messages into Primary, Updates, Promotions, and Social categories, similarly to Gmail's categories, and allows users to move senders to different categories for future organization. Scheduled messages can be set for specific times, ensuring timely delivery even when Penguin Mail is running in the tray. All sent emails include an Undo button for the first few seconds after sending.

With a focus on privacy and user control, Penguin Mail does not host its own server, nor does it collect data, track users, or display ads. Gmail and Google Calendar accounts connect directly to Google, while Microsoft accounts communicate with Microsoft Graph, ensuring no other server has access to users' emails.