I've heard one has to be a bit expert to get sendmail set up correctly...
well, don't know about that. I had it somehow working once, with my own work, but it appeared to not work well always (and I didn't have time to play with it as I really don't need it).
also I've been hearing numerous warnings about sendmail's security problems...and the common advice is: if you need the services of sendmail, don't use sendmail but some "clone" instead....surf the web to find one.
sorry I can't give you proper help but I think google does find a solution if you try hard. if it doesn't, then you need a true guru
p.s. isn't "man sendmail" (in terminal, without quotes) the page that should give you first-hand info?