Free mail server with POP3 recommendation

[sunhux G]

Anyone has any freeware mail server for RHEL 4.x to recommend?

Preferably something with least bug, good spam handling, can set
rules (like Outlook rules), ease of administration & supports POP3?

If SMTP & POP3 rpms are bundled, that would be good;  if not let
me know where to download

I thought of qmail but I can't seem to get the mrtg rpm that's a
prerequisite
for qmail.  Care to point me a url / link to download this & to download
the POP3 rpm?




Thanks
U