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Open Source Email Clients

A curated collection of the best open source desktop, mobile, and web applications for reading and managing email, with multi-account support, search, and encryption..

Macro Mail

Keyboard-first email client with AI, chat, and tasks

  • Stars

    Stars growing quickly over the last 30 days4,898

  • Last commit

    1 hour ago

  • License

    AGPL-3.0
An AI-powered email client that combines inbox management, chat, tasks, and AI agents in one shared workspace, built for keyboard-driven workflows.

Open Source Alternative to:

Gmail

Mailspring

Native desktop email with tracking, templates, and dark mode

  • Stars

    17,938

  • Last commit

    24 hours ago

  • License

    GPL-3.0
Desktop email client for Mac, Windows, and Linux with unified inbox, read receipts, link tracking, send later, grammar checking, and contact enrichment.

Open Source Alternative to:

Apple Mail

Inbox Zero

AI email assistant that automates, organizes, and declutters

  • Stars

    Stars growing over the last 30 days12,794

  • Last commit

    1 day ago

  • License

    AGPL-3.0
Automates Gmail and Outlook with AI-drafted replies, bulk unsubscribe, cold email blocking, attachment filing, and inbox analytics for individuals and teams.

Open Source Alternative to:

Superhuman Mail

Thunderbird for Android

Privacy-first email app for Android, no ads ever

  • Stars

    14,136

  • Last commit

    2 days ago

  • License

    Apache-2.0
Android email client from the Thunderbird project with unified inbox, multiple account support, OpenPGP encryption, and no ads or data tracking.

Open Source Alternative to:

Gmail

Roundcube

Browser-based IMAP webmail with a full email client feel

  • Stars

    7,242

  • Last commit

    2 days ago

  • License

    GPL-3.0
PHP-based webmail client with MIME support, address book, folder management, threaded views, PGP encryption, and a plugin API for self-hosted email.

Open Source Alternative to:

Gmail

UnInbox

Transform team email into efficient collaborative workflows

  • Stars

    1,760

  • Last commit

    9 months ago

  • License

    AGPL-3.0
Streamline team communication with shared inboxes, unlimited email addresses, and customizable workflows. Perfect for modern businesses seeking organized email management.

Open Source Alternative to:

Gmail

Twake Mail

Secure open source email with advanced encryption & AI

  • Stars

    660

  • Last commit

    1 day ago

  • License

    AGPL-3.0
Open source professional email solution with PGP encryption, JMAP protocol, AI-powered responses, and advanced antispam protection. Control your data privately.

Open Source Alternative to:

Gmail
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