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@voxen wrote:

As I’m running both the mail client, the POP3 server and the packet filter on the same PC, I guess that what I must do is:
– capture the outgoing packet
– change its IP and port to localhost/110
– change its MAC address to PC’s MAC address
– recalculate checksums
– send the packet to MSTCP (as stated by SerpentFly above) and not Adapter

So, since the packet originator is the mail client running on the same PC, the source MAC address it the one I should set as MAC destination, right?

Ehm, this is a kind of a special case. You can’t catch internal packets with winpkfilter, so I’m not sure you can also send localhost packets to windows that way. The steps above are correct, but I’m not sure you can inject a packet with localhost destination using winpkfilter. Windows might decide to throw your packets away.. 😕