Postbox has been discontinued. Similar apps include Thunderbird, which is free and open source. Other options are Microsoft Outlook, Evolution, eM Client and Apple Mail. There's no shortage of Email Clients like Postbox, with more than 50 alternatives for Mac, Windows, Linux, Android and iPhone.
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.
Germany
EU
United States
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.
Australia
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.
United States
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.
Navigate messages with zooms and swipes across your messages.
Turn your email into colorful, visual tiles you can explore with your fingers or mouse. Rich 3D visualizations and familiar gestures make TouchMail the fastest and easiest way to keep your inbox clean and keep import.
United States
TrulyMail is an email client and a private messaging system, very feature rich (voice recording, script blocking, etc.).
United States
SolMail is a powerful e-mail client that helps you to manage all of your e-mail accounts & messages in one app!
South Korea
GyazMail is a email client software for Mac OS X, based on Cocoa framework, simple, easy-to-use with many features.
Japan
LeaderSend takes care of delivering your transactional messages and managing infrastructure, while you can focus on your business instead.
Now Manage Your Emails DIRECTLY in Notification Center. Archive or Star an email, Mark an email as Read, Report Spam and Delete emails all with a single tap.
