I was just speaking with Matts, it seems that I too have been the victim of the fake From: address spamming.
I have all usernames at cthompson.com pointing to my inbox, with about ten filtered out. Early last week I started getting bounces at about four a day. Between 5pm last night and 9am this morning, I got 37.
Matt, of course, knew exactly what was going on. "Oh," he said, "You've been Joe Jobbed." It bothers me the practice is common enough to have a name.
I was already fairly convinced in the lack of worth in the human race as a whole. Now I just have proof.