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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