I'll get someone to contact Ford and see what they are running. From google it looks like Exchange. Is this a known bug with Exchange? If so I think there's bigger problems than messagelabs :) Jeroen Massar wrote:
As the subject states,
MAILER-DAEMON@messagelabs.com:
<....@ford.com>: Connected to 136.1.7.8 but sender was rejected. Remote host said: 501 Sender domain must exist
As it obviously checks only the first MX record if there are A records, and if there are none it rejects it. This while there are AAAA records on the first MX, and even A records on the remaining MXs. Thus a proper fix would already be to check the other MXs and of course to check for AAAA too ;)
And that affects all customers at messagelabs, thus if somebody can pass that along to them to fix it, that would be great ;)
Oh and of course the check is also there for postmaster@ thus no way to tell them through that route.
Greets, Jeroen
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