I've noticed in the past few weeks/months that these forums are sufffering from spammers. I don't know if it's possible with PHPBB however it would possibly be worth adding a HRI (Human Readable Image) to the registration page, as this would prevent bots from signing up and posting. Also doing a wildcard ban on "@mail.ru" and "@cashette.com" I've found also helps, as these two domains tend to be a favourite for spammers.
