On Mon, 27 Jan 1997 10:03:09 -0500 Terry A Moore said:
>I'd like to figure out if the key to the error is the "MX records will
>cause loop" or the "User unknown" message. I've never understood the
>MX loop issue. Perhaps one of the gurus here can enlighten me.
My first idea is that lmail.vm.timken.com doesn't do local delivery for
it's name and tries to find MX records for this name. In doing so it
detects that it should send the mail to very the host it's just receiving
the mail from.
Second, I wonder where the TWO recipients come from. Wild guess: the
gateway sees [log in to unmask] and expands to [log in to unmask]
for which it finds an MX to lmail.vm.timken.com. Now it MAY be that this
name has changed recently from lmail.timken.com to lmail.vm.timken.com.
Unfortunately lmail.timken.com is not aware of this change, i.e. it does
not think it should deliver lmail.vm.timken.com locally - this it looks for
an MX for lmail.vm.timken.com which perhaps has none and uses a generic MX
which points to the gateway.
Christian