Logging in as postmaster
From SuperbHosting.net Support Wiki
Mail Admin Login Information:
Every domain has a Postmaster login, which is the Master Account of the entire domain. Only the Postmaster has full administrative control over mail administration for each specific account/domain.
Login as follows:
Master Account: postmaster
Domain Name: yourdomain.com
Password: Use the password you have provided.
NOTE: Always use your own domain name.
