Thunderbird is a fast, flexible e-mail client. Brought to you by the makers of Firefox – the Mozilla Foundation. Thunderbird is a free, open source e-mail client. And just like Firefox, Thunderbird is cross platform, able to run on Windows, Linux, and Mac.
Because Thunderbird is loaded with features, that makes the program a true convenience to use. For example, there’s support for IMAP/POP, integrated RSS reader, HTML mail, quick search, and many more.
In addition to all of that Thunderbird supports add-ons as well! Thunderbird comes with the Lightning calendar add-on by default too. Should you need a high quality, open source email client then look no further and start downloading it. You’ll be glad you did.