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Spambot tracking using Wireshark

Hopefully someone can shed some light on what I’m doing wrong .

It looks like we have got a spambot , somewhere on our home network. So I was pointed in the following

https://community.virginmedia.com/t5/Security-matters/Searching-for-Spambots-on-your-network/td-p/4087596

The problem I’m having is , I’m using my laptop to setup a bridged connection. I’ve used the wireless card and the Ethernet as a bridged connection, I’ve also used a usb Ethernet and the laptops Ethernet. To make the bridged connection.

Wireshark on the laptop is not is not seeing "telnet smtp.blueyonder.co.uk 25" from the testing laptop

So if I swap to the Wifi connection on my laptop and do a trace for port 25 , Wireshark shows that port 25 is active . So help would be grateful received Thanks Joe