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Just becasue the spamputer is sending mail does not mean that it has to accept incoming mail. Even if it is they will quickly learn which mail servers send a bunch of stuff back and just turn on some packet filtering and block everything coming back from them. I'm sure even the lowest level spammers have enough knowledge to setup minor protection.
Even if they don't block it so what? IBM wants to send the mail back to the spamputer. They send a request for a TCP connection on port 25 but the spamputer isn't listening on port 25 so nothing happens for 60 seconds and then the IBM computer never establishes a connection. Wow, 1 packet every 60 seconds.
So maybe they're going to send a bunch of UDP packets or something? Even if they end up with 10% of the mail server market, which is very unlikely, then the best they can do is increase junk traffic on the wire by 10%. Since it's junk traffic it requires no processing so it's kind of pointless because it won't slow things down much at all.
Feel free to send a couple of 1,000 emails to my PC because it's not listening to port 25 and it's going to slow you're system down a lot more then mine.
Maybe I'm just missing something but unless the spamputer is listening for email and processing it then how can it slow things down enough to matter?
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