Back on Mutt!
I have been a huge fan of the awesome Mutt email client for a long time, and have been using it a lot.
However, I had to stop using it 2 years ago as the Mutt/OfflineIMAP/msmtp combo I was using on MacOS didn't work anymore, due to some issues with Python version which made OfflineIMAP unusable.
This all changed now that I'm back on a proper OS FreeBSD!
I have reinstalled Mutt and its buddies OfflineIMAP and msmtp, and can again enjoy reading my emails on my laptop, or even when outside home, by "SSH-ing" over VPN :)
Not much more to add - I reused the same configuration as what I had on MacOS, which includes the very nice notmuch for searching - which I find a lot better than fat clients search functionalities - although Thunderbird became quite good at that in the past months in my opinion.

Habits
One thing that struck me when reusing Mutt: I still remember almost all of the shortcuts I used, e.g.:
- F9 to tell notmuch to search and reconstruct owning thread
B
to hide/show Mutt's sidebar- Ctrl+P / Ctrl+N to navitage up/down in the sidebar
t
then;
to tag and move messages
and the list goes on!
Tags: IT