your best solution would be to keep your SMF for a week or two, sending a global announcement to all your members to update their email to a real one, etc...
if they fail to provide one, that's bad but they will have to deal with the bug to not be able to login to their new account on your new vBulletin.
hotmail.com, mail.yahoo.com, gmail.com ... all these are free, so why use a fake email anymore... tell them to register there if they really need to keep anonymous! then they change their email in their profile, and tada!
---- btw, this solution is a gain for you, because no more fake emails, no bouncing mails when you communicate with your members, they will all receive the email of your announcement when you move to a new forum script.
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