If you are creating the postmaster alias in each local /etc/mail/aliases file, follow these instructions.
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.
View the /etc/mail/aliases entry.
# cat /etc/mail/aliases # Following alias is required by the mail protocol, RFC 2821 # Set it to the address of a HUMAN who deals with this system's # mail problems. Postmaster: root
Edit each system's /etc/mail/aliases file.
Change root to the mail address of the person who is designated as the postmaster.
Use the assigned address for the person who is designated as the postmaster.
(Optional) Create a separate mailbox for the postmaster.
You can create a separate mailbox for the postmaster to keep postmaster mail separate from personal mail. If you create a separate mailbox, use the mailbox address instead of the postmaster's personal mail address when you edit the /etc/mail/aliases files. For details, refer to How to Create a Separate Mailbox for postmaster.