Forwarding two gmail accounts email to an SBS 2008 , one works fine, the other gets following errors on some emails forwarded:
Subject: Delivery Status Notification (Failure)
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).
Using SBS 2008 with MS Forefront