# cat /System/Library/LaunchDaemons/ssh.plist

...
        <string>com.openssh.sshd</string>
...
                        <key>SockServiceName</key>
                        <string>2222</string>
...

mac:~ root# cat /private/etc/postfix/main.cf

mac:~ root# /usr/sbin/postconf -n

...
inet_interfaces = all
...
mydestination = $myhostname, localhost.$mydomain, localhost, gate.isp.un
...
relay_domains = $mydestination
...

mac:~ root# /usr/sbin/postfix check

mac:~ root# /usr/sbin/postfix start

# ls /Library/LaunchDaemons/

[~ ] $ sudo launchctl load -w /Library/LaunchDaemons/org.macports.Squid.plist

[~ ] $ sudo launchctl unload -w /Library/LaunchDaemons/org.macports.Squid.plist

[~ ] $ sudo launchctl list

[~ ] $ sudo launchctl stop org.macports.Squid

[~ ] $ sudo launchctl start org.macports.Squid