It is not possible to recuperate the password of the accounts@domainname.xxx automatically.

However, the change of the password of the accounts through the Mail Admin Panel can be asked to the Postmaster at any time.

The Postmaster needs to access the Webmail using the Postmaster login details and, after  selecting the “Mail Admin option, select the Edit icon of the accounts whose password needs to be changed. Once changed, click on Save, to confirm the new password.