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Exchange 2016 Troubleshooting: Event ID 8019 - Remote Delivery

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In my lab, I am routing mail using DNS and noticed the below warning comes up often on the server.

This is on Exchange 2016 CU17:

https://www.collaborationpro.com/wp-content/uploads/2020/12/image-13.png

Troubleshooting

While the email does deliver it seems to stay in the queue for a few minutes and then it delivers. Other mail delivers instantly so I do not think this is a cause for concern.

On the other hand, it may also be the anti-virus as I didn't see this when no AV was loaded.