On-premises PSA | SMTP Relay Service
On-premises partners were given the opportunity to install a new SMTP relay feature with version 2021.3. This was designed to help partners adhere to the new Microsoft Partner guidelines. After installing however, it was learned that “Due to limitations with Microsoft Graph API” that multiple domains, and email addresses would pose a problem. We saw many install, then remove this service from their servers due to these issues, going back to direct smtp sending. CW