Managing Systems and Workgroups: A Guide for HP-UX System Administrators

Setting Up and Administering an HP-UX NFS Diskless Cluster
Planning Your Cluster Policies
Chapter 10904
Policies for Electronic Mail
Shared Every user mailbox is accessible from every cluster member, and users
can send and receive mail while logged into any cluster member. All
outgoing mail has the appearance of having originated from the cluster
server. All maintenance of the mail system, such as the mail aliases file,
the reverse aliases file, and the sendmail configuration file, is done on
the server. The sendmail daemon runs only on the server.
Private Each client runs its own mail system and that system must be
maintained on each client. Users must log onto the appropriate client
before they can send or receive mail. The sendmail daemon runs on
every member of the cluster.
To set up a shared mail configuration other than the one SAM sets up in
a cluster, select the private mail policy when you create your cluster,
then set up your alternate mail configuration after clients have been
added.