Forum Discussion
Mike McLean (OFFICE)
Microsoft
MicrosoftOffice 365 Groups will now have unique mailNickname
Hi all,
We've completed an enhancement with the Azure Active Directory team which will now enforce mailNickname to be unique across all Office 365 Groups within a tenant. This will help ensure ...
Shouldn't Groups make sure that the mail nickname is unique across all types of mail-enabled objects rather than just inside its own set? Having a synchronisation clash with a DL (for instance) could also be a problem...
- Mike McLean (OFFICE)
This is a great observation. For this first step, we're mainly focusing on enforcing uniqueness across cloud-managed Office 365 Groups. One approach we've seen customers use is to build a universal Alias Reservation List that guarantees uniqueness across all their services that create mail-enabled properties, including on-premises.
I really don't think you need anything more complicated than to check all mail-enabled objects (rather than just Groups as you do today) to detect duplicate aliases...
Exactly. The alias should be unique across all mail-enabled objects in the tenant. If I have an ADFS replying party passing mailnickname/alias as a claim for example, any dups will cause problems, just to give another example beyone Tony's .
