[Mailman-Users] Linux 7.3 and sendmail 8.x problem

I followed the installation procedures for mailman, and the web interface works just fine.

HOWEVER, any email I send into it disappears! It never goes out to the list and doesn't bounce back to me.

Is there something in Sendmail 8.x in Linux 7.3 that prevents mailman from working? Any suggestions on how to fix this? I'm trying to run the list for an online class we teach at the college.

Thanks, Peter Schoch