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Need to see headers from SMTP traffic from router



I have set up the bandwith sensor for my router through SNMP. That only shows usage though. Is there a sensor that will actually show me the email headers going through the router. I believe a computer in my network has been spamming email because we got blacklisted by three services. If this isn't possible is there a way to monitor the network for excessive email spam? I run a windows environment with a Netgear router hooked up to a cable modem. I cannot simply shut down port 25 because I have a lot of Outlook users who use that port.


router smtp windows

Created on Apr 19, 2012 7:39:31 PM

1 Reply



please see this article which describes how to discern excessive bandwidth usage with PRTG. Please not that you may have to adjust some filter rules to see which computer does cause the email traffic.
Best regards

Created on Apr 20, 2012 9:30:22 AM by  Konstantin Wolff [Paessler Support]

Disclaimer: The information in the Paessler Knowledge Base comes without warranty of any kind. Use at your own risk. Before applying any instructions please exercise proper system administrator housekeeping. You must make sure that a proper backup of all your data is available.