Some commands which can help to retrieve a mailbox’s password in Plesk:
1) To find the password for a single email account
root@JHtest[#] /usr/local/psa/bin/mail –info [email protected]
2) To find all email account passwords for a single domain
root@JHtest[#] /usr/local/psa/admin/bin/mail_auth_view | grep domain.com
3) To list passwords for all email accounts in Plesk.
root@JHtest[#] /usr/local/psa/admin/bin/mail_auth_view
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