Mutt - Mutt is a small but very powerful text-based mail client for Unix operating systems.
Mailspring - Mailspring is a mail client for Mac, Windows and Linux.
aerc - Highly efficient and extensible email client for the terminal
Thunderbird - Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!
NeoMutt - NeoMutt is a command-line mail reader. It's a version of https://alternativeto.
Claws Mail - Claws Mail is an email client (and news reader), based on GTK+, featuring Quick response