Sounds like you have the answer - what was the question?

Steve Spittal wrote:

> Forgive me if this is an of topic posting. We use exchange 5.5 sp4 with
> content filter Baltimore's  "mail sweeper" which has all mail forwarded to
> it from exchange. Content filtering machine has routing of *.* which should
> force an MX lookup through external DNS and send the mail.
> We have now on two recent occasions received mail that users have tried to
> reply to, and they receive an NDR stating "smtp; 550 5.7.1 Unable to relay
> [EMAIL PROTECTED]" this clearly means that no MX record exists for the
> domain. Which I have confirmed via nslookup. Can anyone serve up any clues?
> Thanks
>
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