Nail (program/MUA)

Nail is a some times lightweight console-based mail client, made to be a modern replacement for the ancient mailx command. It's fully compatible with mailx, but has a lot more features, which makes it appropriate for everyday use. Nail supports POP3, IMAP, and SMTP out of the box, so there's no need for further programs like Fetchmail or Postfix. It also has a built-in Bayesian spam filter, so you don't need external tools like SpamAssassin.

Source http://www.linux.com/feature/51767