Dear Team,
Last 15 days we are facing only office 365 emails are stuck in queued (Contoso.com) on Exchange server 2013.
We have removed the Anti-Virus from the exchange servers, but no luck
We also disabled the throttling policy on the server but still issue.
we have observed that email start to stuck in queue 12:30PM and it will automatically release from the exchange queue 5:30PM.
last Error : 451 4.7.500 Server busy
Please help to resolve this issue
Regards, Prashant