I've got a server running RHEL5 and Sendmail. Is there a quick and easy way to send all email for unknown users straight in to /dev/null or somewhere else where they will never be heard from again?

If you go to your /etc/mail/virtusertable, you can delete (or comment out) the last line, which should read something like: @yourdomain.com emailusername

Then restart sendmail.

Hope this helps.

--Alden

Thankyou, I'll give it a try.