How to Use sendmail in the Open Mode

The sendmail service has been changed so that it would run in local–only mode by default. The local-only mode means that only mail from the local host is accepted. Messages from any other systems are rejected. Earlier releases were configured to accept incoming mail from all remote systems, which is known as the open mode. To use the open mode, use the following procedure.

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Caution  - Running sendmail in the local–only mode is much more secure than running in the open mode. Make sure that you are aware of the potential security risks if you follow this procedure.

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1. Become an administrator.

   For more information, see Using Your Assigned Administrative Rights in Securing Users and Processes in Oracle Solaris 11.2 .

2. Set the sendmail properties.

   # svccfg -s sendmail
   svc:/network/smtp:sendmail> setprop config/local_only = false 
   svc:/network/smtp:sendmail> quit

3. Refresh and restart the sendmail service.

   # svcadm refresh svc:/network/smtp:sendmail 
   # svcadm restart svc:/network/smtp:sendmail