Having following problem receiving email:
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).
I have applied on my SBS 2008 exchange server a IP ALLOW LIST specifying gmail.com,. still I get this failure.
How can I get this fixed! Reasons why?