Email & notification APIs
Mail and calendar for Linux and macOS
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A desktop email and calendar application for Linux and macOS that supports Gmail, Microsoft, IMAP, POP3 and JMAP accounts with integrated contacts and optional
Penguin Mail is a free desktop application for Linux and macOS that consolidates email accounts from Gmail, Microsoft, and any IMAP, POP3 or JMAP server into a single interface. It includes calendar views from Google, Microsoft, and CalDAV providers, contact management, and support for email encryption via OpenPGP and S/MIME.
The application offers multiple features for email management including Gmail-style category filtering, scheduled sending, message flags, smart mailboxes, and bulk actions. It supports seven languages and includes an optional AI assistant that can summarize messages, draft replies, and manage calendar events.
Penguin Mail operates without its own server infrastructure. User data stays on the computer, with Gmail and Google Calendar accounts connecting directly to Google and Microsoft accounts connecting to Microsoft Graph. The application is distributed as free software under GPL-3.0-or-later license.
Pricing model: Open source
No. Penguin Mail has no server of its own and your mail stays on your computer. Gmail and Google Calendar accounts talk to Google directly, and Microsoft accounts connect to Microsoft Graph. Your data does not pass through any other server.
Penguin Mail supports Gmail, Outlook.com, Hotmail, Live, Microsoft 365, Fastmail, Stalwart, iCloud, Yahoo, and any server that supports IMAP, POP3, JMAP or SMTP protocols.
Yes. Penguin Mail supports both OpenPGP and S/MIME encryption through your own GnuPG. The application never holds your keys or asks for your passphrase.
Yes. Penguin Mail is free software distributed under the GPL-3.0-or-later license for Linux and macOS.
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Penguin Mail has a free listing. The owner can unlock the full profile with a paid launch for $5:
FlareMailA web email client for Cloudflare Email Routing and Workers that turns infrastructure into a usable inbox
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