FYI, if you don't need to run sendmail as a daemon, don't set the MAILSERVER=-YES- option in your hostconfig file like the O'Reilly article suggests. If you do, sendmail will take *forever* to initialize each time you reboot your machine. If you're just using sendmail periodically you shouldn't need to run it as a daemon (but it largely depends on what you're doing with it).
And lastly, the O'Reilly article is correct -- you'll need to run *two* instances of sendmail. It's not a typo.

