I guess it comes down to this: if you are handling a ton of mail and mail is a big part of what you do, the rules are different. You can consider to look past the investment needed to get sendmail and qmail[1] to perform.
or anything else :)
If you are handling relatively low volumes of mail, say the low tens of thousands a day, and "mail guy" is not a shout you respond to, then I strongly recommend not becoming a white-coated acolyte to these and to make the smaller brain-investment needed to get Postfix working great.
heh, so you don't recommend sendmail for a small site? I had trouble imagining using sendmail for anything else!
-Andy
[1] qmail's license used to be source distribution only, because that locked out anyone unable to compile it and its dependent packages and "killed the weak". Mail isn't that hard! Mortals can get Postfix going!
mail wasn't that hard i would say. Now, putting a mail server on the Internet means getting a handle on a whole lot of things.