Columba is described as 'Email client written in Java, featuring a user-friendly graphical interface with wizards and internalionalization support. Its a powerful mail management tool with features to enhance your productivity and communication' and is a Email Client in the office & productivity category. There are more than 50 alternatives to Columba for a variety of platforms, including Windows, Mac, Linux, Android and iPhone apps. The best Columba alternative is Thunderbird, which is both free and Open Source. Other great apps like Columba are K-9 Mail, Evolution, FairEmail and Microsoft Outlook.
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Experimental terminal mail client aiming for configurability and extensibility with sane defaults.
Mulberry is a powerful, easy to use electronic mail (email) and calendar program that allows you to send, access, and manage email and calendars. Mulberry also helps you manage other related information, such as contact information.
mu is a tool for dealing with e-mail messages stored in the Maildir-format, on Unix-like systems. mu's main purpose is to help you to find the messages you need, quickly; in addition, it allows you to view messages, extract attachments, create new maildirs, …
GyazMail is a email client software for Mac OS X, based on Cocoa framework, simple, easy-to-use with many features.
Koma-Mail is an email client which is comfortable and has very handy functions. It does not need an installation, so that you can run Koma-Mail from your flash drive but, of course, also on your desktop.
EmailTray is a smart email client and an email notifier for POP3 and IMAP email accounts, including Gmail, Hotmail, Yahoo mail and AOL. EmailTray intelligently ranks messages, prioritizes them into 4 Inboxes and alerts you only to the most important.
TrulyMail is an email client and a private messaging system, very feature rich (voice recording, script blocking, etc.).
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