4. Sending mail from inside Oxford
This section relates to sending mail from inside Oxford to oxmail in its smarthost role. This should be done by MTAs. MUAs should use the message submission service.
ICTC Regulations require hosts to be registered in the DNS. Hosts that are not are denied service.
Since all Oxford IPs must be registered in the .ox.ac.uk domain, the
HELO argument must end in
.ox.ac.uk . This is effective
protection against compromised hosts running ratware which forges the