Feb 18 2021 04:09 PM
Feb 18 2021 06:16 PM
@Psshutdown
You probably should, if there might be a need to configure TLS with partner.
What is the domain will be used for?
Feb 19 2021 02:12 AM
Feb 19 2021 01:09 PM - edited Feb 19 2021 09:05 PM
@Psshutdown
Yes, that is the must, here are the requirements.
If you changing the name space:
Add mail.newdomain.com and autodiscover.domain.com to UCC SAN certificate containing other domains.
Potentially re-do virtual directories.
New DNS zone SPF MX , Autodiscover, records for the new domain.
Add custom domain in Azure, verify.
Add domain under Accepted Domains in on-prem Exchange.
Add email address policy in on-prem Exchange. (should be lastest or n-1 CU version)
Apply email address policy to users
Validate AADConnect replication status
Validate mail flow.
Change user UPNs to new domain?