We have been testing DKIM and have it fully functional.
In short DKIM - Domain Keys Identified Mail , will allow the receiving server to identify the sending server with a digital key similar to SSL.
Using DKIM will help to prevent your email from being rejected as spam.
Want a full explnation? Reat this article DKIM What is it and why do we need it?
At this time in order to enable DKIM for your email you will need to turn in a support ticket and we will set it up for you.
This is a free service
Note: Eventually all accounts will be switched over automatically