1> To find password for a single email account
root@server[#] /usr/local/psa/bin/mail --info info@domain.com
2> To find passwords for a single domain
root@server[#] /usr/local/psa/admin/bin/mail_auth_view | grep domain.com
3> To find passwords for all email accounts.
root@server[#] /usr/local/psa/admin/bin/mail_auth_view