F*ckity F*ck F*ck F*ck

E-mail is dead.
In the last two hours, I’ve received over 100 bounced email notifications, because some asshole spammer decided to send out hundreds, if not thousands of unwanted messages advertising “Ho`w to b’uild your own busines’s we,bsite” using return addresses in my domain. The bounce messages are coming to me because I use a catch-all email box to get mail on my domain. These messages are not easy to block, because each one is going to a different address– each a different random combination of 7 letters.
If there’s any good way to deal with this problem using either spamassasin or procmail recipies, I’d appreciate hearing about that method. I can’t figure out a good way to filter out these bounce messages. Because all use a different address at my domain, I can’t simply send all mail to that address to /dev/null. Because I don’t want to filter out all bounce messages, I can’t filter based on the subject line. I don’t want to give up using the catch-all into my primary mailbox, since I use a large number of different email addresses depending on with whom I am corresponding.