/dev/random

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Inspired by this story, I wrote a little script which I named spamslam:

#!/bin/sh
for ((i=0;i<$1;++i));
    do echo curl -s $2 ; curl -s $2 >/dev/null;
done

When I get a piece of spam, I find the URL of their web site and append some nasty message to it and then run this script to repeatedly issue that request, which will leave a nasty little message in their server logs.