$ SET DEF SYS$SPECIFIC:[TCPIP$SMTP]
$ EDIT TCPIP$SMTP.CONF
Subsitute-Domain : domain.com !change the email address domain
$ TCPIP !open TCPIP manager
$ SHOW MX_RECORD !show mx records
$ SHOW HOST !show list of local hosts/DNS records
$ SHOW HOST <MX_record> !example of a host entry
$ SET NOHOST <DNS_record> !removed the local host
$ SET HOST <DNS_record> /address=x.x.x.x !add a new local host