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I have a forum on a website I master, which gets a daily dose of pron spam. Currently I delete the spam and block the IP. But this does not work very well. The list of blocked IP’s is growing quickly, but so is the number of spam posts in the forum.
The forum is entirely my own code. It is built in PHP and MySQL.
What are some concrete ways of stopping the spam?
Edit The thing I forgot to mention is that the forum needs to be open for unregistered users to post. Kinda like a blog comment.
In a guestbook app I wrote, I implemented two features which prevent most of the spam:
Don’t allow POST as the first request in a session
Require a valid HTTP Refer(r)er when posting