The newest phpBB version does have integrated captcha with control over difficulty: http://www.phpbb.com/about/features/
I think using captcha for every post is not necessary as a properly registered user has already been verified. Of course one could register a valid account and then use a bot software to post using that account but I doubt that spammers would bother doing that as it's only worth it if everything is fully automated.
SPAM SOLUTIONS THREAD
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