Randy wrote:
It appears that exchange uses some other criteria to check sender domain or that it does additional checks and simply rejects with that message. I do realize that I could set up something where we accept the mail to these domains, scan it then drop the email if it is tagged as spam. What about the mail that passes the content scanning? And what happens when this particular mail gets through and they send 1 million.
Perhaps I misunderstand your problem but wouldn't using "expand_owner_alias" solve your problem?
You said you are forwarding email to some users. The 'problem' with forwarding is that the original envelope sender is used and any bounce will therefore be delivered to the original sender. Why don't you set an owner alias for all forwarded email with the alias set to the spam account of the forwarder user? If the email is not accepted by the external server you are forwarding to the email will be bounced to the spam box of the forwarded user and not to the original sender.
Kind regards, Martijn Brinkers -- Djigzo open source email encryption