Alternatives
I've been using Claws Mail on Ubuntu for years now. Before that I used KMail, Thunderbird, and various others. I'm very happy with Claws and I much prefer it to Thunderbird because it's so much simpler and much, much, faster. I am using it strictly for POP/SMTD mail but it does IMAP as well (although I haven't tried that feature).
It has shed loads of plugins, so check those if you want things like PGP integration or spam filtering.
It's a fairly traditional three-window GUI interface, but I like that in a mail client. It's fast, simple, and lets me get through my mail quickly. There is no feature that I want that it doesn't have. It focuses on one thing - mail, and does it well. It doesn't change much from version to version, and quite frankly I like that as well. It uses the standard mbox mailbox format, so it is compatible with a lot of other standard mail handling tools.
Overall, I highly recommend it.
Biting the hand that feeds IT
