We're trying to find a computer on our network that is sending out malicious packets by using Wireshark 0.99.7. We want to detect all packets (not for the computer running the program but for either our entire network or our router) that are directed to port 25 (outgoing email port) but not being sent to our email server. Our email server is hosted by an outside company named Netplex, and the IP address of our SMTP server is: "204.213.176.35", and our default gateway (i.e. the address of our router) is "192.168.0.254". Please keep in mind that we aren't very familiar with networking. Could you provide step by step instructions on how to setup a filter, including menu options to choose, the syntax of the filter, etc., and how to start capturing packets? Thank you.
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