I don’t know if the AC68U has this but check in your router settings for this. ⋮
Advanced Settings, Firewall, Network Services Filter. Enable Network Services Filter and under Network Services Filter Table leave Source IP, Port Range, Destination IP blank, set Port Range to 25, add the rule, and then select Apply.
BTW Advanced Settings, System Log, Connections history may help identify spambot; under Destination column look for entries ending with :25
Some malware infections have multiple attack vectors after being installed.
There is the danger that blocking outgoing connections on port 25 at the router, blocking spam bot activity, still leaves the possibility that other potentially nefarious activity such as key logging will continue until the infection is identified and removed.
A false sense of security is possibly more dangerous than the malware infection itself.
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Sorry to hijack this post but I am wondering if any members on here have been able to discover and solve the spam bot issue please?? I am having a nightmare find and removing the spam bot.. I have tried several techniques using wire shark and port 25 settings and then creating a hotspot connecting my devices to it, etc.. And nothing is found at all in wire shark even tho it has been running for hours, not 30mins... But I am still blacklisted.. What am I doing wrong?? This has been going on for weeks