Thunderbird
Thunderbird is the email client from Mozilla, the makers of Firefox. It is developed by Mozilla Corporation and hundreds of volunteers. Thunderbird is based on the Gecko rendering engine Just as the web browser Mozilla Firefox, Thunderbird aims to be a fast, functional and powerful program. The program is a fully featured, secure and very functional email client and RSS feed reader. It lets you handle mail efficiently and with style, and Mozilla Thunderbird filters away junk mail too. There are lots of add-ons available for Thunderbird that enable you to extend and customize your email experience. There are versions of Thunderbird for Windows, Mac OS X and Linux. There is also a Portable Thunderbird use on your USB stick. there are regular new releases