Currently, I use Kmail as part of Kontact. Have a few problems with (occassional crashes, starting up without displaying etc) it and would like to change however...
The reason we use KMail is that makes it easy to change which email address you send from. Go to compose an email and you can either choose a profile from a dropdown (which also changes signature) or simply type in an infrequently used From: address without having to set up a profile.
What other IMAP email clients can do this?
(Would be nice if they could pick up a reply profile based on the email address an incoming email was sent to as well)