I am installing Veeam 9.5 Update 4 now and testing the Oracle RMAN Plugin.
I confirmed that the RMAN Plugin works without any problems and that you can perform basic backup and restore.
However, backup using RMAN Plugin did not receive email notification of success, failure, or warning.
Is it not specification that mail notification is not done?
Successful email notifications were disabled by default to make sure that Veeam B&R won't kill you mailbox due to email report being generated every RMAN job run. Try to add the following registry key to Veeam B&R registry hive.
The regkey requires global email notification option to be configured. Can you please double check that it's enabled in Veeam B&R console? Thanks!
EDIT: My bad, I missed one value for the key. If the email notification is configured you need to set value to 4 to get all notifications including successful ones.