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Is there a way to have a domain added to Exchange Office 365 where instead of a bounce back message for users not found, it sends out a custom message?
If I have no user firstname.lastname@example.org instead of sending back 'does not like recipient.' bounce back it says some custom message.
Unfortunately no there is no way to customize the NDR in Office 365 and catchall addresses aren't allowed either, you are stuck with the standard NDR.
Jorge R. Diaz
Microsoft MVP | Office 365
MCITP: Office 365 Administrator
Check out my Blog
1 out of 1 people found this post helpful.
As Jorge said, there is no way to customize the NDR message. Therefore, I would like to know why you want to customize the NDR. Maybe we can find a workaround for that. Thanks.
How are things going on your side? If you need further assistance, please let me know. Thanks.
The reason is we have a domain name that we would like to phase out as the spelling is very similar to the main one, for example we have one with the number 2 instead of TO and it would be great if someone emailed the 2 address to have a bounce back saying please email the person at the TO address, does that make sense? Right now I would have to add all the users to the 2 address and make sure people inform the users.
I understand your concerns.
There is my suggestion, I hope it works on your environment. We could set a transport rule “if recipient includes domain @xxx.com, then block the e-mail with notification ‘please resent the e-mail to @xxx2.com’”.