What not to do about spam

There is one cardinal rule to remember when dealing with spammers and rogue sites: we must hold the high moral ground.
Therefore, when dealing with a spammer or a rogue site, don't:
Threaten violence or vandalism;
Mailbomb the site;
Mailbomb the alleged spammer, who may be an innocent third party such as myself;
Ping-storm or SYN-flood the site;
Hack into the site;
Try in any way to bring the site down illegally. And above all else, don't use spam to fight spam. This also applies in Usenet - don't follow up to spam postings, lest your posting also become spam.