30. April 2011 12:37
I was previously trying to prevent comment spam by blocking access by ip address. However it does appear that this really isn't very suitable. The amount of comment spam did drop from around 500-600 items per day to around 40 - 60. So it just is not effective enough and you also run the risk of blocking valid users from accessing the content on the site.
I have now come up with a new method which is a much safer and does not require the overhead of using a database. I decided to look into the web server logs and noticed that the clients are bots and not really web browsers they only request then postback a valid page in an attempt to get the comments to appear on the site. So this new approach uses this to an big advantage.