small mail server

[Robin Becker]

I'm looking for some advice on using one of our existing freebsd 6.x servers as
a mail server for a small number (<20) of users.

Our existing provider gives us

1) pop3/IMAP for reading mail
2) SMTP for sending, but we need to read mail before using smtp; I guess this 
implies we don't need to authenticate directly.
3) web based interface for adding users and redirections etc etc
4) spam filtering (presumably based on their large user mail volume).
5) white/grey listing


-- 
Robin Becker