You have to immediately change the password for your login account after your system is installed. Once the new password is established, establish a regular schedule for changing the password, for example, at least monthly. Be sure to inform any other messaging administrators or system administrators of the change in passwords.
Both system administrators and messaging administrators can change passwords. Messaging administrators who log in with the Non Privileged Administrator account can change the password for the that login only. System administrators who log in with the Privileged Administrator account (custom user-login) can change the password for both the Privileged and Non Privileged Administrator login.