Yeah I'll have to disagree here. I beat my head against this horribly documented MTA just trying to get virtual users to work with a relay host. I gave up after three days of slitting my wrists trying to get it to work. It's horribly documented, getting help out of the obsd folks is like getting blood from a turnip, but if it works for you great! But I would never agree it's easier to configure or has better documentation than postfix.