[Zope] Using sendmail on FC5 with Zope 2.8.7

Hi, I'm trying to get Mailhost to work on Fedora Core 5 with Zope 2.8.7. Sendmail is up and running on FC5, Mailhost is installed and set to localhost, port 25. However, nothing seems to happen when an e-mailable event occurs. I did not configure sendmail in anyway, it was the stock one on FC 5 install. I don't know where to begin as to how to get this to work. -- IV