Thunderbird's Quality

I really hope they improve the quality of Thunderbird itself first, the last time I used it... it was... less than optimal for my tastes. There is a fork; Betterbird that aims to fix many of the issues; they've done a good job of fixing many of the long-standing issues. Here's hoping Mozilla take note and make the changes upstream.

That said, I personally am quite content with my neomutt for the time being. It's very easy to setup, very easy to use and just works. I really cannot complain. I just love the simplicity of it, it does its job and does it well. :-)