sendmail in opensolaris
...by default is accepting connections only from localhost . Not very useful if you want to have a functional mail server. To allow connections from everywhere svccfg is the way to do it: #svccfg -s sendmail setprop config/local_only=false Don't forget to : #svcadm refresh sendmail and restart the sendmail server: #svcadm restart sendmail To check if it is ok, run: #svcprop sendmail [...] config/local_only boolean false [...] and telnet your_host 25 from outside. More info about svcprop and svccfg .