SMTP Relay Logs

Question

Good afternoon,

I have been tasked with trying to get a list of IP Addresses that route mail through out SMTP Relay servers.
These servers have the SMTP role installed and are being used to route mail from various applications and MFP devices for things such as Scan to Email.
Within IIS we have SMTP Virtual Server
Our SMTP traffic for these things IS NOT being routed through our Exchange Online setup.

I looked in where we have the logfiles specified and I see lots of entries, but I keep seeing a recurrence of the same 5 IP Addresses, so I am not sure if that is correct place to try and get that information. Right now we have the Allow setup for ranges of IP Addresses, we are looking to narrow that down to specific addresses that send mail through them.

Is there any place I can find that beside where we have log files specified in the Properties of SMTP Virtual Server. The image contains what we have configured for LogFiles.
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Thank You

Brian Dougherty