What does MessageID not matched mean?

That means DLR received from vendor is not matching with MessageID which was originally sent. For e.g., you have configured two different gateways from same vendor that is Gateway 1 and Gateway 2. When message sent G1 but received a DLR from G2. In that case the above message will appear under Event Viewer Logs.

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How does Event Viewer DLR works?

Event Viewer DLR can be checked if DLR being sent from Gateway Provider but not updated in iTextHUB application, in such case you can check if DLR being received from same gateway which was sent originally.

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