Forum Discussion
change Undeliverable email messages auto reply
Hello. I have a shared mailbox who only the member of the mailbox can email to. If you are not a member and email to the mailbox you get an auto reply. This auto reply are a bit aggressiv...
You cannot change the text of default NDR messages in O365, such as the one sent when delivery restrictions are configured on a mailbox. You can add a custom reason via a Transport rule (with a "block the message" action"), but in general those NDRs look not that friendly...