Forum Discussion
Multiple forests, single Azure AD tenant
You need a separate namespace as detailed here: https://technet.microsoft.com/en-us/library/jj873754(v=exchg.150).aspx
- Namespace planning
Each forest in which you install Exchange requires its own unique externally-discoverable namespace. You'll specify a forest's unique namespace in the Hybrid Configuration wizard when you run it in each forest.
Thanks Vasil,
regarding namespace, it should be ok to point MX record to Exchange online?
Mail(OWA) and Autodiscover should be pointed to on-premise.
During hybrid config wizard I already did specify separate namespace (mail.domaina.com and mail.domainb.com)
Still I don't understand why emails are not delivered. I have already changed both domains to internal relay in O365. Maybe I need to create separate connector for both on-premise to communicate over. Will need to test it tomorrow when I'm back at work
Yes you need to run Hybrid Wizard it will setup the connectors for you !
Hi Simon,
as mentioned earlier the HCW have been run in both exchange environment, but still did not help.
Unified GAL is not working either, since they can only see contact from own environment. In Exchange online we do see them together.
According to earlier link, seems like everything should work by default, but it does not work for us: https://technet.microsoft.com/en-us/library/jj873754%28v=exchg.150%29.aspx?f=255&MSPPError=-2147217396
