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SMTP Relay Logs

Joe Marcellais 21 Reputation points
2021-04-19T21:04:58.54+00:00

We have a O365 hybrid environment with an on-prem exchange server that also serves as a SMTP relay. Is there a way to see who is sending messages to the relay server via IP address instead of the preferred method of using the DNS name?

Exchange Server Management
Exchange Server Management
Exchange Server: A family of Microsoft client/server messaging and collaboration software.Management: The act or process of organizing, handling, directing or controlling something.
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  1. Andy David - MVP 148.8K Reputation points MVP
    2021-04-19T21:08:51.203+00:00

    No, the Exchange Server protocol logs will only show the IP address of the sending client. The DNS lookups are handled by the client itself, Exchange doesnt have any ability to know if the client is using DNS or sending to the IP directly.

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