After being temporarily turned off, guest posting by unregistered or non-logged in users has been enabled but visual confirmation (Captcha
is now required. Previously, it was only required for registration. This should eliminate most of the spam posts we have been getting.
However, one problem with the visual confirmation system we are using is that it is not accessible to visually impaired users. There are other confirmation systems that provide those users with the option to use an audio captcha but I am not aware of this being available for phpBB (the forum software we use). Until one does became available, those users should contact the editors for assistance.