Sorry, but there has never been a bounced email hack/addon that functioned in that way, there is no easy way for you to do that via vbulletin either, not through the user move feature anyway.
PhP script to check against the user table for the emails listed, then a change to their usergroup, should do it, but would require a custom script.
Even if you do move them to that group, the email verification email via cron isnt going to reach them.
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