i saw a few days ago were a guy used a query to find all the email address's in his data base
that would give you a list of all email address. and i think someone also showed them code to get he names too or handles not sure i will try and look later its back a few pages
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yep here it is
https://vborg.vbsupport.ru/showthread.php?t=243487
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run that query via acp(Maintenance --> Execute SQL Query)