Hi,
We have a hybrid set up of Exchange 2010 and Office 365. If this is not the correct place to post this, please move to the necessary place.
We have added a new domain(domain5.com) in Office 365. We have the same domain in On Premise Exchange also. We have then migrated an on premise Exchange user abc@domain5.com to Office 365. This migrated user can send mails to on premise Exchange. But the reply will not reach Office 365. Exchange on premise users cannot send any mail to this migrated user also.
The mail when tracked reaching one of the on premise hub cas server and staying there.
The migrated user can send and receive mails to other Office 365 users and also other external domains.
Please let me know the steps to resolve this issue.