I have another site that I posted to a lot a few years ago regarding some … er … medical issues I had - namely Hodgkin’s Lymphoma. I kept an online journal regarding my diagnosis, treatment, and recovery. It was very therapeutic for me, and based on the feedback I have gotten it has helped a few people going through similar situations.
Starting yesterday I must have crossed some threshold related to page rank with that site, or the spammers sunk to an all new low. At the rate of about one per minute, I began to get posts to the ‘guestbook’ that were nothing more than advertisements for cheap Cialis, Viagra, etc. Doubly annoying when you consider that each one of these posts sends an email notification to me. So not only do I get the normal glut of spam from them every morning, I get a whole extra assload of spam emails that come from me.
I had a client have a similar problem and he tried to block the IP address to no avail, they kept rotating through using different ones - I assume this is some sort of an automated spider that trolls around looking for forms to submit to.
Anyway, a quick keyword filter may not be perfect but it will keep them from posting and in the unlikely event that it is a human it will send them directly to a fun location.