We are running SSRS 2016 - Product Version 13.0.5337.0 - and I have a report for which I set up a subscription to have it delivered a distribution group callled "Company X PMO" plus other individuals who do not belong to that group. The individuals who do not belong to the group are receiving the email subscription each morning but not any of the members of the distribution group.
Per instructions I found from Microsoft, I modified the rsreportserver.xml file to the following value:
Configure a Report Server for E-Mail Delivery
Some other notes that may be of interest, the RS Service Account runs under a domain account like "CompanyX\CompanyXSQLAdministrator" and the Sender Address has been configured as "noreply@companyX.com".
I have asked for verification that the "CompanyX\CompanyXSQLAdministrator" account has "Send As" permissions on the mailbox, but the group still does not receive the email subscription. I don't have access to the Exchange server so I have to trust these setting were changed correctly.
I can't find much documentation on this issue besides a post on Stack Overflow and one on Experts-Exchange but does anyone have any other suggestions on how to get this working?