And this never, ever works.
In all my years on the internet, I've never seen a dedicated and persistent troll actually fade away by being ignored. Why? Because there will always be someone who just can't ignore it. It's just not realistic to think that on a newsgroup or email list or forum with dozens if not hundreds of people, every single one of them will be able to refrain from responding.
I withdraw increasingly from online interactions because the urge to want to punch people through the internet is too strong.