Some external users, but not all, have problems sending emails with pdf attacthments to our exchange server. I have tried to recreate the error by sending pdf-files with my hotmail and gmail accounts but i never have any trouble. This is the error the other external users get somteimes.
Delivery to the following recipient failed permanently:
Technical details of permanent failure:
Google tried to deliver your message, but it was rejected by the recipient domain. We recommend contacting the other email provider for further information about the cause of this error. The error that the other server returned was: 550 550 5.7.1 Message rejected as spam by Content Filtering. (state 18).
Is there a way to see exactly the reason why this message was rejected? Is there a summary somewhere in exchange that lets me see which part of the mail that gets spampoints or which part of the mail that is the offending part?