Become superuser or assume an equivalent role.
Roles contain authorizations and privileged commands. For more information about roles, see Configuring RBAC (Task Map) in System Administration Guide: Security Services.
Create a user account for the person who is designated as postmaster. Put an asterisk (*) in the password field.
For details about adding a user account, refer to Chapter 5, Managing User Accounts and Groups (Tasks), in System Administration Guide: Basic Administration.
After mail has been delivered, enable the mail program to read and write to the mailbox name.
# mail -f postmaster
Use the assigned address.