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Yeah, I'm pissed. Really pissed. When does comment spam become a DDOS attack? There's a fine line, and some a**hole crossed it this morning. I knew there was a problem when I sat down to eat my cereal and read the news this morning and the Windows XP…
I was thinking about switching to WordPress from MT because I thought the spam support was better... I guess not. I have been depending on MT-Blacklist to handle the blog spam filtering needs. When I was getting hit once or twice a day, it wasn't a big deal. But then "Bob" showed up and was leaving 6-7 a day. I put up with it for a month, and then I remembered someone who develops their own blog started turning the comments off on entries that were over a week old. So, I turned off all of the comments except for the latest ones. This has been a huge success.
If I wanted to get fancy, I could create a cron job to run everynight that would go in and update the database, but it hasn't gotten that painful yet so I just do it manually.
I've been using the Spam Karma plugin for WordPress for a few weeks now. It's based on some code that I wrote a while earlier that intercepts comment spam based on various criteria. The new plugin - compiled by someone else - has a centralized spam regex wordlist, a backup captcha system for when it's not absolutely sure a comment is spam, and very nice integration into the WP admin layer. You can opt to receive an email digest of deleted spam comments, or nothing at all. A possibility for the future is to employ the existing wordlist export capabilities of the plugin to build a distributed comment spam prevention network.
Most importantly, ZERO of the recent holdem, debt-consolidation, viagra spams have seen the light of day on my site, and I haven't had to moderate much of anything for the current count of 2516 spams received.
Check it out: http://unknowngenius.com/blog/archives/2004/ 11/19/spam-karma-merciless-spam-killing-machine/
My Drupal based site is currently getting hammered by an idiotic tosser pushing Texas Hold'Em Poker sites and Viagra substitutes. My spam filter has eaten almost every single one, so I don't really care about that - but my referral and visitor stats are becoming absolutely unusable - regularly shooting up by a couple of hundred visits and fake links to everything from 'valeofglamorganconservatives' to straight 'click-here-for-shitty-poker-site' stuff and AdminShop's 'Hey, were you seriously pissed about this fake link? Click here to buy some software that'll let you do it to other folks!' Luckily, nobody else ever sees it.
It's seriously driving me up the wall, but I refuse to switch off comments just because of one or two tossers.
Deane, try WPBlacklist from Fahim Farook. It's well written, integrates nicely into WP and has a host of configuration options.
I wrote a quick IP blacklist plugin for my Wordpress site in response to the problem of comment spam coming from anonymous http proxies. It sounds like you're seeing the same spam campaigns I am, so you're welcome to my plugin if you want it: http://www.elsewhere.org/wp-blackhole/
It's worked well for me so far. As a side benefit, I've compiled a list of 254 open http proxies, should I ever need one.