Outgoing email is sending correctly and internal email is sending and receiving. But, incoming email (outside) is being rejected with error:
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: 554 554 5.7.1 (ex:<firstname.lastname@example.org>):Recipient address rejected: Access denied (state 13).
Small Business Server 2008