Forum Discussion
New subdomain but e-mail addresses are already in use?
I just created a new subdomain in our M365 for special purpose e-mails & 3rd party mailing support. When I attempt to create a new shared mailbox mailto:address@subdomain.domain.tld I get the error t...
Not hybrid. AAD Connect synced and pw synced (one-way) but not EO hybrid.
Wouldn't make a difference, tho, since the address@subdomain recipient does not exist anywhere on-prem.
Wouldn't make a difference, tho, since the address@subdomain recipient does not exist anywhere on-prem.
Hi Jaycenornin,
What happens if you send an email to this address? Do you get a bounceback notification? If not, can you do a message trace against the test message and see what became of it?
What happens if you send an email to this address? Do you get a bounceback notification? If not, can you do a message trace against the test message and see what became of it?
- Of course there's an NDR.
I've already deleted and recreated the DG on-prem in order to free up the address on the subdomain. The work I needed to get done is done.
The problem is that this is an issue with something in M365 reserving addresses for subdomains. It's not an error or a hidden recipient, it's a thing with how M365 works. I want to know what and why.