Magellan is a KDE-based alternative to Evolution. It is a personal information manager handling email, contacts, notes, tasks, to do lists, and journals. For email it supports mail retrieval via POP3, IMAP4, and local mailboxes. An interesting feature is that it supports mixed-mode POP3 and IMAP4 accounts where each account can be a completely different identity (e.g., if you have multiple email accounts on different servers with different usernames).