Using sendmail in Open Mode
The sendmail service runs in local-only mode by default so that only mail from the local host is accepted. Messages from any other systems are rejected. Open mode accepts incoming mail from all remote systems.
 | Caution - Running sendmail in local-only mode is much more secure than running in open mode. Make sure that you are aware of the potential security risks. |
In order to set up sendmail in open mode, you must have administrator privileges.
To change the sendmail properties to allow incoming mail from remote systems, issue the following commands:
# svccfg -s sendmail svc:/network/smtp:sendmail> setprop config/local_only = false svc:/network/smtp:sendmail> quit
Refresh and restart the sendmail service to make the change take effect.
# svcadm refresh svc:/network/smtp:sendmail # svcadm restart svc:/network/smtp:sendmail