Viraj's Weblog

b2evolution has some simple blog antispam features, but it relies on a list of strings that in my opinion is not very scalable. I have been wanting to add SURBL support for awhile, and finally did. It was much easier than I expected. I had found some complicated solutions to do this in PHP, but really all I needed was URL parsing and DNS functions, both of which PHP has. All I did was modify the antispam_url() function in _functions_antispam.php with this PHP code. It also makes sure any URL domain has a proper MX record before it is accepted.

The b2evolution developers suggest making plugins for modifications, but I felt the above too simple to warrant class inheritance and all that crap. We'll see how it works. Unfortunately, SURBL is mostly for links in spam email, and I doubt their submission form would accept blog comment spam. Anyhow, I think it should help somewhat.