You can modify the Registered Users group so that (new) users always have their posts moderated.
Then set up a new group (e.g., Verified Users) with the exact same permissions as the RU group, except that members of the new group do NOT have their posts moderated.
Finally, set up a promotion task (ACP->Usergroups->Promotions) so that, upon so many posts being made by the user, s/he would be promoted to the new group.
His/her posts would then be unmoderated.
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