Thunderbird

Thunderbird is Mozilla's e-mail client solution.

Earlybird is the "unbranded" version of Mozilla's Thunderbird e-mail client.

Installation
Emerging Thunderbird is a long process, a precompiled version exists with shorter install duration:

Note that behavior of the precompiled version may be different in many ways including the choice of default applications run for URLs.

xdg integration
Ensuring thunderbird being used by other applications for handling mailto: links can be done with