To Meany Guests

To Meany Guests
Was I the only person who read this and thought it could be "Dear mean people" rather than "Too many guests"? ;)

Regardless, the best solution I've found for my low traffic site is to use a hard captcha for each post when the user isn't registered - and I also get an email notification when this happens (not often, bear in mind this is a commenting-on-posts system rather than a forum, so may not scale up.)

If you really want to allow posts from unregistered users and your sight is higher traffic, I'd throw a hard captcha on there, put an automatic spam filter on there, perhaps pass through a blacklist check (Blacklist Check) for good measure, disallow all posts containing images or URLs, and if it passes all of those criteria have it send you a notification with the message with a quick link in the email you can use to ban or allow on sight. If you ban then add that IP to a blacklist.

Given all of the above, I'd say it's not really worth it for the small, un-loyal user base you'll gain from allowing anonymous posting - it's a lot of work for potentially very small gains.
 
a lot of the porn spam (IIRC) was old members who had been banned coming back with a grudge.

I think it was about half and half - the overly gross ones were angry people the more "standard" porn felt more like bots/every day spammers.
 
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