Sup is an open source curses threads-with tags style email client. It presents a list of threads, which are each hierarchical collections email messages.
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NeoMutt – fork of Mutt with added features
NeoMutt is a command line mail reader. It’s a fork of Mutt with added features. NeoMutt is a project of projects.
Read moreKMail – email component of Kontact
KMail is an email client included with the KDE desktop. It is the email component of Kontact, a integrated personal information manager.
Read moreMailspring – new version of Nylas Mail
Mailspring is an open source, cross-platform email client that is a development of the now discontinued Nylas Mail.
Read moreBalsa – highly configurable e-mail client
Balsa is an e-mail client for GNOME, highly configurable and incorporating all the features you would expect in a robust mail client.
Read moreTrojitá – Qt IMAP email client
Trojitá is a Qt-based email client that aims to be fast in operation and function over slow or high-latency networks. It’s desktop agnostic.
Read moreAstroid – lightweight and fast mail user agent
Astroid is a lightweight and fast graphical email client. Search, display and compose email, organized in thread and tags.
Read moreGeary – send and receive email
Geary is an open source lightweight mail client for GNOME that is written in Vala. It offers a slim and economical user interface design.
Read moreClaws Mail – email client and news reader
Claws Mail is a powerful and full-featured mail client formerly called Sylpheed-Claws. This is free and released under an open source license.
Read moreSquirrelMail – webmail package written in PHP
SquirrelMail is a webmail package written in PHP. It has all the functionality you would want from an email client.
Read moreRainLoop – modern and fast web-based email client
RainLoop webmail was designed with efficient memory use in mind, so it can work fine even on low-end web servers.
Read moreSnappyMail – web-based email client
SnappyMail is a simple, modern, lightweight and fast web-based email client. It’s free and open source software written in PHP and JavaScript
Read moreMailpile – email client software
Mailpile is a fast email client with user-friendly encryption and privacy features.
Read moreRoundCube – browser-based multilingual IMAP client
RoundCube Webmail is a browser-based multilingual IMAP client with an application-like user interface.
Read moreScrollout F1 – for administrators without advanced email security experience
Scrollout F1 is an easy to use, highly configurable email firewall (gateway) for multiple domains and servers.
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