I blocked 202.58.80.0/20, 65.94.252.160, 24.64.178.253, 216.196.194.162 and 203.162.0.0/16 from deekayen.net for trying to spam me with my own contact form. The emails never made it to my mailbox thanks to the server's spam filter, but I saw the attempts in my logs. They were over a span of eight minutes, so someone either has a nice drone network setup for spamming or a sophisticated network of servers. I didn't bother to see if they were in dialup pools or not. I don't much care about traffic from Malaysia or Vietnam, so those are the two blocks I denied. When I upgrade to Drupal 4.7, I'm adding captcha support for the contact module.