Exchange 2019 SMTP Receive Connector

Copper Contributor

Hi Tech,

 

We have Exchange 2019, SMTP Open Relay Receive Connector.

 

We have around 300+ services using this connector. Recently We engaged a few customers and performed exercise to send email with Authentication.

 

My question here is, How we can find which smtp connection/IP is relaying emails using authentication and which connection/IP is relaying email anonymously/without authentication.

 

I tried finding authentication tags in smtp receive connector's logging without any success.

 

Any idea or direction to achieve this? Thank in Advance.

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