This might help:
http://wordpress.org/support/topic/96820?replies=9
I personally have registration turned off and let Spam Karma keep an eye on comments:
http://unknowngenius.com/blog/wordpress/spam-karma/
A fix that IMO is more effective than blacklisting can be found here, if you are prepared to modify a php file. In effect, it changes the default registration process and inserts a mini-Turing test to ensure that there is someone on the other end of the line.
you can download this hack of register-form with captcha. It is beta version! 🙂
Example
Download
hello
can you please help me
i reciept in ower registaratie form a lot of this kind of e mail (sex web cams)
what can i do about it
regards josette from the netherlands
Auteur : Ccdccxbccdf (IP: 68.184.132.243 , 68-184-132-243.dhcp.stbr.ga.charter.com)
Email: 4cb@pcxxc.com
URI : http://samuelson5.blog.dada.net
Whois : http://ws.arin.net/cgi-bin/whois.pl?queryinput=68.184.132.243
Reactie:
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I found a plugin that puts a Captcha up on the registration form it’s called CapCC and you can find it here http://fuctweb.com/2007/06/15/capcc/ seems to work well.
Not one spam registration since I installed the plugin above a few days ago! I’m happy!
The Sabre plugin is an appropriate answer to this issue.
You can check it at http://wordpress.org/extend/plugins/sabre
