Hi, I have used mollom to stop russian bots from registering on my drupal 6.20 site effectively since I set it up.
(backstory)
I also had memcached running with the drupal memcache module. For some reason anonymous users were not seeing new content, only if you logged in could you see new content. I resolved that issue by stopping the memcached service, thinking that was enough to stop drupal from trying to use memcached (hey anonymous users could see new content finally)
However I later found out users couldn't get past mollom. No matter what you put in for the captcha it would fail.. (unknown session id) it turned out to be related to memcache.. I removed the memcache include from settings.php and it was resolved..
Finally my real problem:
Now last night a Russian bot (user?) registered successfully. My dblog doesn't go far back enough to tell if mollom shows a "CAPTCHA PASSED"
In the apache logs I don't see that they ever clicked the account verification link that should have been sent to them in the email, which I can see was sent in the sendmail logs.
How did they get through? Maybe this was a real user?
username: chinagifts
email registered: sales08.fzop@gmail.com
IP address: 121.204.53.102
Reverse DNS: 102.53.204.121.board.fz.fj.dynamic.163data.com.cn