On Wed, 16 Oct 2002, Tom Coady wrote: > ... > > <[EMAIL PROTECTED]>: host mx1.redhat.com[66.187.233.31] said: 550 5.0.0 > <[EMAIL PROTECTED]>... You msut use a valid mail server
This may mean the last mail server your mail passes through before it
tries to get to a redhat server is unregistered, or is registered in some
way that upsets the redhat server. It would be useful to see the
headers on the bounced message and especially the "Received:" ones.
Michael Young
