Balsa is an e-mail client for GNOME, highly configurable and incorporating all the features you would expect in a robust mail client.
Platforms
- Linux
- GNOME
- Xfce


Thunderbird is described as 'Cross-platform email client providing POP/IMAP support, robust filtering, multiple accounts, and chat. Extendable via add-ons with RSS/Atom, etc' and is a leading Email Client in the office & productivity category. There are more than 50 alternatives to Thunderbird for a variety of platforms, including Windows, Mac, Linux, Android and iPhone apps. The best Thunderbird alternative is Claws Mail, which is both free and Open Source. Other great apps like Thunderbird are Evolution, Betterbird, SeaMonkey and K-9 Mail.
Balsa is an e-mail client for GNOME, highly configurable and incorporating all the features you would expect in a robust mail client.


Stoop is a dedicated inbox for subscription content, including email newsletters and video channels, helping keep your personal email uncluttered. It operates without algorithms, allowing for a focused interaction with content.



ProfiMail is a powerful email client for mobile phones. It allows you to read your mail on the go, and send text with attachments directly from your phone. Send photos, recorded sound or simply text messages to friends, from anywhere.
Features:




Unibox is a people centric email client that organizes your messages by person. It avoids having email like a to-do list.






FileOne is an organizer that combines and integrates your notes, documents, contacts, email, photo's/images, calendar and agenda with multimedia.




Eudora started in 1988, at the University of Illinois because the internet was a growing and burgeoning place, but email was not really established on the desktop computers that people were using at the time.
SolMail is a powerful e-mail client that helps you to manage all of your e-mail accounts & messages in one app!




Emilio is an AI-powered email manager that automates tasks to save users time. The key functionalities include sorting prioritized emails, summarizing messages and drafting emails with the user's tone.



Experimental terminal mail client aiming for configurability and extensibility with sane defaults.




yMail2 is a standalone email client for Windows (and Linux), available for free since 2003. Now with SSL support included so you can use it with Gmail and Hotmail POP3 and SMTP accounts.

Historically, Iceape was a re-branding of SeaMonkey by the Debian project. However, Debian discontinued Iceape in December 2013 citing security concerns and lack of a maintainer.