Article ID: 2015177 - View products that this article applies to.
An external sender receives a non-delivery report (NDR) that resembels the following after the sender sends an email message to a Microsoft Forefront Online Protection for Exchange (FOPE) stand-alone customer.
554 5.7.1 email@example.com: Recipient address rejected: Access denied.
This issue occurs because the email address of the recipient is not in the FOPE Directory-Based Edge Blocking Reject list in the domain.
To resolve this issue, follow these steps:
Note If you use the FOPE Directory Sync Tool (DST), make sure that the account is in your on-premises Active Directory Domain Services (AD DS) domain.