Thank goodness for ignore. And perma-ban.
A while ago, I had someone spam one of my blogs on its previous host. It was so bad it got my account there temporarily suspended and left behind a huge mess. Even though it was blocked and "bounced", it caused such a problem that the shared servers it was on lagged so bad, it had to be reset (or something like that). Imagine around 1,000 messages per day for a week or two, but not seeing them because they were being auto-blocked. Ever since that day, spammers have been up there along with trolls and trogs. Very sad individuals indeed, in my opinion.