Non-Delivery Reports:
An NDR is a report of an attempted email delivery failure. The report contains diagnostic information that points to the delivery failure. If you receive a non-delivery report, contact your exchange admin. If CallTower is hosting your Office 365, open a case with support and provide a copy of the report.
Please validate that we host the exchange by checking in Salesforce on the Account page. If Calltower does not manage the exchnage, we will not be able to make corrections.
Process:
Have the customer forward the Non Delivery Report.
Save the NDR and attach to the case
Check the NDR code https://www.microsoft.com/technet/pr....mspx?mfr=true
Review the NDR to find the reporting server.
Depending on the reporting server and the specifc NDR this may need to be escalated or referred to the receiving parties exchange admin.