@polychrome
If thunderbird fits your workflow I am not sure it is worth it. Configuring mutt is a pain, the documentation is not as friendly as you would expect if you are used to e.g. vim. I tried out thunderbird while looking for a client and the only reason I didn't decide on it was that there was no clear way I could convince it to do what I want, or whether it was possible at all.
@timorl yeah I'm fairly comfy with Thunderbird but it's not very responsive at times and worse the email search function is terrible.
For casual type mail reading it's just fine tho!