I couldn't find anything about this in the documentation - of course, I may have missed something..
PS: I moved this post from TODO / New Features where I originally posted it (probably wrongfully, sorry!) [originally posted on jforum.net by mortenhelles]
Migrated From Jforum.net
Joined: Apr 22, 2012
Yes, jForum has Captcha (image) support built in. You can enable this via the configuration files. IFAIK, you can require this at various levels up to being required to post (even if logged in).
Look thru the SystemGlobal.properties for the "Captcha" tags to add into your jforum-custom.config file. [originally posted on jforum.net by monroe]