alpine

Mail client which aims at being “fast, easy to use email client that is suitable for both the inexperienced email user as well as for the most demanding of power users”.

alot

MUA written in Python using the NotMuch backend; MailDir format support.

mbsync

Mailboxes synchronization tool; allows to download email locally; MailDir format supported.

Mutt

Mail client with tons of features, customization chances, support for IMAP, POP3, multiple storage formats.

sup

MUA written in Ruby; specifically developed for accounts with “a lot of emails”; nice thread-based presentation.