How can I check if other appliances are "hitting" my exchange server with smtp traffic?

I have a number of scanners, fax machines, etc. that email via smtp to my exchange server. they are all setup the same, but a couple cannot get email through. I am allowing relay from all IPs internal to my network on my Exchange 2007 system. How can I chhck smtp traffic or connections mde to my CAS server. Thank you.
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jss1199Connect With a Mentor Commented:
Enable SMTP loging per the steps in

With this log file, you can use your favorite log viewer (trace32!) to see all connections to your SMTP server.
QTHConnect With a Mentor Commented:
You can also use netstat -an to see what are the active connections to your server and review the SMTP Virtual Server connections.
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