Sendmail is EVIL!
I have come to the conclusion that as a whole Sendmail is an evil that must be stopped. It is right up there in my book with BIND as an inherent evil program that has been maintained well past its usefulness. A good example of this is I have been configuring a server to send out emails for various web app we run. First you must install sendmail-cf and m4 in order to get any real functionality. Then you have to go through and edit one of the worst designed configuration files in the history of config files. The only config file that may rival it is the Dovecot one. Which still at least makes sense even though it is 10 pages long. Just do yourselves a favor and uninstall all sendmail and replace with Qmail or Postfix.