I'm not up on the latest and greatest, but my Mandrake 9.1 install
seems to offer

cyrus-imapd
courier-imapd 
imap-2002a

as IMAP servers.  I think they'll all do POP3, too.

No Guarantees or recommendations!  

I don't know anything more than the fact that these are available!  If
you install one of them, and it wipes your hard disks or mails all
your credit card numbers to someone nefarious in the FSU, it's not my
fault!!!!  :-)

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