Source IP of Email Sender

Question

We have created multiple receive connector for application servers to relay emails outside of organization.

How can I know particular email ID is triggered from which server ?

Exchange 2019 on premise server.

Answer 1

Check Message tracking logs for the client IP:

https://learn.microsoft.com/en-us/exchange/mail-flow/transport-logs/message-tracking?view=exchserver-2019#fields-in-the-message-tracking-log-files

If you do not see the client IP in message tracking, enable SMTP protocol logs on the receive connectors:

https://learn.microsoft.com/en-us/exchange/mail-flow/connectors/configure-protocol-logging?view=exchserver-2019