The Bat! Professional Edition 6.7.2

The Bat is an e-mail application that supports multiple POP3 accounts, true multithreading, MIME and UUencode standards, multimedia, message templates, minimization to the system tray, message notification, APOP authorization, and PGP. You also will find a fast and comfortable message editor with text highlighting, as well as a mail dispatcher for managing messages on servers.

Mozilla Thunderbird 31.1.0

Thunderbird is a fully featured, very functional, secure email client and RSS feed reader, created by Mozilla. It offers a pretty and streamlined interface to a very powerful email package and lets you handle mail efficiently and with style, and Thunderbird filters away junk mail too.