Sendmail out-of-box secure enough?

Hello list, Here is a question perhaps a little naive :-) I am not sendmail expert at all and I do wonder... Is sendmail in SuSE Linux out-of-thebox secure enough for a with permanent connection to inet? I mean just setting the configuration "Host with permanent network connection" in Yast2... In case it is not (I guess) what minimal config do you propose to run a sendmail to just deliver emails from localhost to inet and to allow receiving only emails for its own domain? Any good recommendations? Cheers Pep Serrano.