Other considerations

If DNS is to be used for mail server searches, each VIPA with a unique name should be added to the name server as an MX record. If DNS is not being used for mail server searches, DNS searching can be turned off by adding the /etc/mail/service.switch file containing the following line:

hosts files

Sendmail.cf has /etc/mail/service.switch as the default location for this file.

If you use a shared aliases file, the user specified as postmaster in /etc/mail/aliases must be permitted to all security labels supported for sendmail. If you need to have different aliases, you must provide a separate aliases file for each security label. The user specified as postmaster in each security label-specific aliases file must be permitted to that security label.