01/01/07
Sender Policy Framework is now active.
We have activated our SPF rules for the entire XCS system, sending servers without the correct SPF credentials may have great difficulty sending mail to XCS users. For more information, see our SPF guidelines.

27/01/07
Reverse DNS Policy.
As of 01/03/07, we are untaking new measures to prevent SPAM from our users using RDNS testing tools. If you are unsure whether your mail system is behind a network with Reverse DNS, see our troubleshooting guide.