So few days before we had a power outage and exchange 2013 server went down. When power was restored, we had database in dirty shutdown. We repaired the database and users were able to access emails. however, there were 2 mailboxes that showed quarantine. I ran a repair request on those mailboxes, but still, it didn't help.
Finally, I disabled their mailbox after taking PST and created a new mailbox for them. Now they were able to access emails from the new mailbox. External send receive from these emails works fine.
However, when any internal user emails them they receive NDR. Even the two user cant send emails to each other internally.
Remote Server returned '550 5.1.1 RESOLVER.ADR.ExRecipNotFound; not found'
i tried to remove the autocomplete email from outlook and they fixed the issue for a day, but the same situation now. I tried to send emails from owa and it works fine.
I think there is some problem with x500 email addrerss.
Can someone help to find a resolution for this?