Thunderbird is an e-mail communication application. It aims to be easy to set up and customize and feature-full. It is part of the Mozilla project.

https://www.mozilla.org/en-US/thunderbird/

http://mirrors.besplatnyeprogrammy.ru/mozilla/thunderbird/releases/

Thunderbird TXZ

Extensions: enigmail

Seamonkey - integrated browser and email client and more

Thunderbird homepage

Thunderbird forum (MozillaZine)

Importing PST files

How to move Thunderbird profile (post) - a Thunderbird profile (therefore mail) can be shared across Puppies and distributions. On Frugal this involves taking it outside of the PupSave file