Since aioe.org doesn't require authentication there is no way to block abuses without forbidding all users to post in some group. The list below shows which groups are currently only readable for my users and it's updated once a day.
|46||alt.politics||word salad spam I|
|47||alt.usenet.kooks||word salad spam II|
|50||comp.os.linux.advocacy||spam serio di massa|