[SLE] Sendmail help

Hello, I am trying to get sendmail set up on my server, it says that it is running, but I must have set up something wrong, every time mail is sent to the server it is returned to the sender with the following error: A message that you sent could not be delivered to all of its recipients. The following address(es) failed: Rob@ncc-a.net: (rob is a user on the system) forced failure: nouser User Unknown Can anyone point me in the right direction? thanks. Rob -- To unsubscribe send e-mail to suse-linux-e-unsubscribe@suse.com For additional commands send e-mail to suse-linux-e-help@suse.com Also check the FAQ at http://www.suse.com/Support/Doku/FAQ/