Postfix or Qmail vs. Sendmail.

Hi again, I am concerned about the security of Sendmail, in comparison to Postfix or Qmail, but don't have much insight on the issues involved. Likewise, as I am a newbie to Linux, I am hoping to reduce the learning curve in my attempts to get Mutt to work the way I want it to. Would I be better off with Postfix or Qmail? What are the pros and cons? Where do Fetchmail and Procmail fit into the scheme of things? Cheers, Brian