Michael Schwendt wrote: > Can anyone please sum up what the problem with dsl.pipex.com is > compared with durham.ac.uk? Both don't resolve, but durham.ac.uk > is accepted by mx1.redhat.com. > > The only difference I see is that dsl.pipex.com has a TTL of 10 > minutes.
I think it either has to be that or some other factor we don't have any
information about, for example maybe Red Hat uses some anti-spam filtering
based on DNS look ups.
Michael Young
