Banks, credit unions, insurance companies,
Notifications are not sent to distribution groups
|Symptoms||If a user`s e-mail address is specified as a recipient, notifications work.
If a distribution group is specified as the recipient, notifications do not come through
|Cause||This is related to authentication settings.
By default, even if the Exchange receive connector accepts anonymous SMTP, sending to distribution groups requires clients to be authenticated.
|Resolution||There are two solutions:
Alternatively you can run the following command via Exchange Management Shell:
Set-Mailbox -RequireSenderAuthenticationEnabled $false -Identity %group%, where %group% is like email@example.com