[Zope] what process does Zope run as?

What process does Zope run as in Windows XP? I finally tracked down the 10053 errors in Plone's MailHost down to port blocking in one of McAfee's virus scanners. But neither enabling port 25 for python.exe, java.exe, or pythonservice.exe seems to work. Getting rid of the port 25 blocking does, but that gives my sysadmin fits. Thanks, Lars