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Verify email and block user feature are already there, check admin panel.
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Iam referring to giving the users the ability to block other users from answer their questions and sending them private messages, and verifying email when you are registering by filling out your email twice...
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it is not clear from your question.

Blocking users feature is not supported by q2a, you may need to write plugin for this.

registering with same email is not possible with q2a.
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