I still find astroid to be the best of the notmuch clients, however I've encountered a number of bugs (e.g. it messes up umlaut letters when replying) and it's

I still find astroid to be the best of the notmuch clients, however I've encountered a number of bugs (e.g. it messes up umlaut letters when replying) and it's not developed anymore. Also if you have a thread with several long unread emails scrolling up and down takes a while, this becomes especially annoying when you want to just open the an attachment. There were also issues about actions for attachments if I recall correctly (I haven't looked into that in a while). I've tried alot and neomutt at some point, but for both you can not view multiple emails at the same time, which is quite annoying.