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Thunderbird - Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!
Mu4e - Starting with version 0.9.8, mu provides an emacs-based e-mail client which uses mu as its back-end: mu4e.
Geary - Geary is an email application built for GNOME 3.
Mutt - Mutt is a small but very powerful text-based mail client for Unix operating systems.
Evolution - Apps/Evolution - GNOME Wiki!
Mailspring - Mailspring is a mail client for Mac, Windows and Linux.