i use postfix in our RHEL4 boxes relaying to an AIX machine
that is using sendmail.
in case you are interested to switch to postfix, i edit
/etc/postfix/transport
and added this line:
* :[a.b.c.d]
# a.b.c.d is the address of my aix machine
and in /etc/postfix/main.cf:
transport_maps = hash:/etc/postfix/transport
relayhost =
of course, in the AIX machine, my RHEL4 boxes are allowed to
relay.
but in my other aix systems, i've set in their /etc/mail/sendmail.cf
files the ff:
DSmachine_where_i_can_relay
and has cron job running with this command:
export NSORDER=local
/usr/sbin/sendmail -q
(since sendmail in my aix systems are not using
DNS for name lookups).
also, in machine_where_i_can_relay, the aix "clients" are
allowed to relay. i have /etc/mail/relay-domains with the following:
machine1.yourdomain.com
machine2.yourdomain.com
hth.