Thunderbird
thunderbird is a free, open source, cross-platform e-mail, news and instant messaging client. the project strategy is modeled after mozilla firefox.
Mutt is a small but very powerful text-based mail client for Unix operating systems.
Mutt is a small but very powerful textbased mail client for Unix operating systems. Some of its features are: color support, message threading, MIME support (including RFC2047 support for encoded headers), PGP/MIME (RFC2015), various features to support mailing lists, including listreply, active development community, POP3 support, IMAP support.
Support for IMAP POP3 Support Command line interface S/MIME support
Productivity Utilities Online Services
imap-support email-client imap pop3 xfce command-line-interface command-line nntp s-mime-support
thunderbird is a free, open source, cross-platform e-mail, news and instant messaging client. the project strategy is modeled after mozilla firefox.
Free Open Source Windows Linux BSD Mac Haiku
Part of the Microsoft Office Suite, Outlook is a personal information manager that lets you manage your e-mail, calendar, contacts, and tasks.
Commercial Mac OS X Windows Android iPhone Android Tablet iPad Web Windows Phone
There’s big news attached. The best way to manage email on a Mac gets even better with OS X Yosemite.
Free Mac OS X iPhone iPad
Opera Mail powerfully organizes, indexes, and sorts your messages. It has spam filtering (both automated and Bayesian), supports POP3 and IMAP, newsgroups as well as Atom and RSS feeds.
Free Mac OS X Windows
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 Extensibility ...
Free Open Source Windows Linux BSD Xfce
The free Zimbra Desktop client allows you to meld the online and offline worlds – storing and synching your email, calendar, contacts, files and documents in the cloud, yet having them locally accessible when on the road.
Free Personal Mac OS X Windows Linux
KMail is the email component of Kontact, the integrated personal information manager of KDE. Kontact is a personal information manager and groupware software suite for KDE.
Free Open Source Mac OS X Windows Linux BSD
windows 10 has mail and calendar apps already built in.
Free Windows Windows RT