Sylpheed

Evolution is the official personal information manager and workgroup information management tool for GNOME. It combines e-mail, calendar, address book, and task list management functions. It has been an...

Based on Thunderbird but Postbox is not open source. "A new way to work with email Postbox offers powerful new ways to find, use, and view email messages and content, …

Claws Mail is an email client (and news reader), based on GTK+, featuring Quick response Graceful, and sophisticated interface Easy configuration, intuitive operation Abundant features ...

The shareware e-mail client has been developed by a Moldavian company. The Bat supports IMAP and POP3 and has integrated S/MIME as well as PGP and supports external GPG. The …

Mutt is a small but very powerful text-based mail client for Unix operating systems.

A modern, fast web-mail client with user-friendly encryption and privacy features. 100% Free and Open Source software.

A super sexy, ultra simple desktop mail client built in vala Postler aims to be easy, simple, clean, beautiful, and automagic. It handles IMAP beautifully, and provides the user with …

Sup is a console-based email client for people with a lot of email. It supports tagging, very fast full-text search, automatic contact- list management, custom code insertion via a hook …

ALTO is a webmail provider which connects to existing mail accounts. Currently AOL, Gmail, Yahoo, iCloud and any IMAP email service are supported. Metadata about mail messages, along with an …

Trojitá, is a fast Qt IMAP e-mail client that respects open standards and facilitates modern technologies. Trojitá values vendor-neutrality that IMAP provides and is committed to be as interoperable as …