Use the web site's IP as the domains MX addr; since they listen on
different sockets, there is no conflict ;-)
e.g., this might be part of the zone file:
@ IN A 192.168.100.100
IN MX mail
www IN CNAME @
mail IN CNAME @
Daryl
-- +|Daryl S. Banttari, CNE|mailto:daryl@2ndlevel.net|http://www.2ndlevel.net/daryl|"Talk does not cook rice" - Chinese proverb|'Good things come to those who wait, but only the things left by | those who hustle.' - Abe Lincoln|'A candle loses nothing by lighting another candle' - Fr. James Keller|'There is a diminishing return on caution' - Me+