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.
Make a copy of /etc/mail/cf/domain/solaris-generic.m4 or your site-specific domain m4 file.
# cd /etc/mail/cf/domain # cp solaris-generic.m4 mydomain.m4
Add the following line to the file that you just created.
Build and install a new configuration file.
If you need help with this step, refer to How to Build a New sendmail.cf File.
When you edit the .mc file, remember to change DOMAIN(`solaris-generic') to DOMAIN(`mydomain').