When I had a problem I created an additional registered2 users group.
Registered required all posts to be moderated.
Then created a promotion when someone was a member for 2 days or had 1 post they moved to registered2 where they were not moderated.
The logic being if someone was going to spam they do it as soon as they are confirmed.
Banning ip addresses don't work since most people have dynamic ips.
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