Hi guys.
one domain has been moved to Office 365. This domain was on exchange 2013 premises before.
We have deleted that domain on accepted domains list on on premises exchange 2013.
We kept users mailbox onpremises until we conclude everything Works fine.
We have removed mail allias (the domain that was moved to Office 365) on this users mailbox.
Internal mail flow still Works internally.
Mx records on internal and external dns points to Office 365.
If we sent an email from internal exchange user to this domain it still gets delivered internally.
What else to check?
bostjanc