That's a very good question. I have never run into this myself but I would say that they need to re-sign up with a valid email address and be told to tread carefully. All it takes if giving one person access to what they say it their old account and finding out later they are not who they said they are.
--------------- Added [DATE]1274835741[/DATE] at [TIME]1274835741[/TIME] ---------------
Here you go. This should help with future users so you don't run into this problem again without a backup plan.
https://vborg.vbsupport.ru/showthrea...95#post2043395