A weblog authored by Carthik about the latest in the WordPress world.

Saturday, November 20, 2004

Learn From the Other Camp

Filed under: — Carthik @ 4:40 pm

Brad Choate has created a new plugin for MovableType, called MT-DSBL, which is a port of a WordPress trick, as published at the Daily Irrelevant. That’s the kind of stuff my monkeys like to see — more interaction, and more blogging tools talking to each other, through users and developers. The hack checks to see if the IP address is present in a list of servers which can be abused to send mail on behalf of spammers, of the kind usually used by email and now comment spammers. If the comment seems to be coming from such a server, it is not posted.

By the way, a new plugin, called DNS-anti-spam by the Daily Irrelevant is available. This one checks the URIs in the comment against the Spam URI Realtime Blocklist. That SURBL contains URIs linked-to in email spam messages. These are often the same URLs left behind by comment spammers in comments.

Also, in a comment to Brad’s post, Jacques suggests using the opm.blitzed.org list of open proxies for checking.

Why not do all three?
Check against the lists at:

  • opm.blitzed.org
  • dsbl.org
  • SURBL.org

Such a neato idea! Really.


  1. When I first started using MT-DSBL I was blocking a lot of spam, but that’s now dwindled to hardly any. In fact the only blocking it was doing was of a regular legitimate commenter who just had a sucky ISP. I now have it set to moderate but I’ve yet to have any spam that falls foul of it.

    Would be cool to have it use the other blocklists too though – nice suggestion!

    Comment spam, while affecting MT users more than others, is something that needs an effort on all parts to be stopped so a bit of collaboration between camps is welcome.

    Comment by Neil T. — 11/20/2004 @ 7:44 pm

  2. Yes Neil, I too find that the spammers work around anti-spam measures without too much difficulty. I suppose what is really required is a comment-spam RBL, but that idea has to catch on, first.

    Comment by Carthik — 11/20/2004 @ 8:08 pm

  3. You guys need Mudbomb’s Spam Stopper (http://mudbomb.com/archives/2004/11/05/spam-stopper-hack-for-wordpress/). Since installing it, I haven’t had a single spam comment. Instead of trying to maintain blacklists, it changes the name of the comments file so that the spambots can’t find it. Dunno if MT already has something like this, but I think it’s genius.

    Comment by Heliologue — 12/12/2004 @ 6:21 pm

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