Moderately Effective: Target his user ID rather than his fake email addresses. He frequently creates minor variations and multiple permutations of his fake email addresses in order to evade filters. However, despite his early desire for Usenet anonymity, he wants his identity to be readily recognized, so he will usually post under the following user IDs:
JRH
Charles
John HUDSON
Upon reading this notice, he will probably change his user ID, but given his past history, it seems unlikely that he will change that user ID very frequently.