having multiple postmaster domains

Brass Contributor


We recently acquired some companies and merged their domains.email/accounts into a single M365 tenant. One acquisition was suppossed to be private. What happened though is a customer emailed the private comapany and a reply from postmaster at otherdomain replied.  Now the customer is asking what is up.


Is there a way to change the default postmaster per domain, or no?  I see this

Configure the external postmaster address in Exchange Online | Microsoft Docs

but that seems to be only one address.



1 Reply
Afaik no, the setting is on the tenant level, not per-domain.