Forum Discussion
email not received
Verify the message was sent out properly from Exchange Online by performing a message trace in the Security and Compliance center: https://blogs.technet.microsoft.com/exchange/2018/05/02/new-message-trace-in-office-365-security-compliance-center/.
If you can find a successful delivery there, you'll need to search the message tracking logs in your Exchange on-premises environment to see what happened with the delivery: https://docs.microsoft.com/en-us/exchange/mail-flow/transport-logs/search-message-tracking-logs.
I find that most times with this, the issue actually was an end user mistake/error; either the sender mis-sent it or the recipient lost it. But the message tracking above will help you find it on the backend.
Verify the message was sent out properly from Exchange Online by performing a message trace in the Security and Compliance center: https://blogs.technet.microsoft.com/exchange/2018/05/02/new-message-trace-in-office-365-security-compliance-center/.
If you can find a successful delivery there, you'll need to search the message tracking logs in your Exchange on-premises environment to see what happened with the delivery: https://docs.microsoft.com/en-us/exchange/mail-flow/transport-logs/search-message-tracking-logs.
I find that most times with this, the issue actually was an end user mistake/error; either the sender mis-sent it or the recipient lost it. But the message tracking above will help you find it on the backend.