On Wed, 16 Oct 2002 12:05:22 +0100 (BST), M A Young wrote: > On Wed, 16 Oct 2002, Tom Coady wrote: > > > ... > > > > <psyche-list@redhat.com>: host mx1.redhat.com[66.187.233.31] said: > > 550 5.0.0 > > <aovt15@dsl.pipex.com>... 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. No, it's a get-host-by-name lookup as demonstrated in my message from "Wed, 16 Oct 2002 13:06:46 +0200" (Message-Id: <20021016130646.0b863573.rh0210ms@arcor.de> ).
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