Spam is bad enough. But spammers forging mail from your domain are even worse. Here's a screenshot of my current email inbox, unedited:
Apparently, some spammers have been sending spam using forged addresses under my domain, markwang.com. As you can imagine, while they haven't spammed me directly, I'm suffering indirectly in terms of being inundated with bounce messages. I've gotten over 100 of them in the last 24 hours. The messages seem to come from hosts all over, so I'm guessing they got 0wned through some Windoze security hole and are unwittingly broadcasting the same spam using my domain.
I hope my web provider has a clue and realize I'm not the one spamming, lest they pull my website.
Well, at least I've gotten some exotic bounces in foreign languages... =P