Thanks abdi.
I use this steps:
cd %plesk_dir%\MySQL\Bin
mysql.exe -uadmin -P8306 -p<THE ADMINISTRATOR PASSWORD>
use psa;
SELECT concat(mail.mail_name,'@',domains.name) FROM mail INNER JOIN domains ON mail.dom_id=domains.id WHERE mail.account_id=0
The MSDOS return the emails with empty password.
From Plesk Panel. you can set new password or delete account