Honestly, don't talk about doing it just do it :). I can totally relate to where this guy is coming from at least from an anger stand point. A couple times at work we have actually had critical E-mail aliases used for customer support crippled because of waves of spam and we have decent filters (even the best gateway filters get crumpled when you have a spam peak wave and virus issues at the same time though). Really though if you get that angry take legal action don't make written threats with big red flag words.
I find the orginators defense for the situation somewhat amusing "He said his firm does not send spam but blamed a rival firm which he said routes much of their unsolicited bulk e-mail through Russia and eastern Europe. Mackay said such firms gave a bad name to the penis enhancement business." and yet it was clearly his adds that the guy was responding to.