As the article explains:
Domain Assurance has an audit and registry to authenticate e-mail, and allows ISPs to block unauthenticated messages such as spam and phishing attempts.
The service will provide ISPs with an audit of e-mail streams so they can identify e-mails that are safe to go through. An e-mail flagged as "bad" will be blocked by the mailbox provider or ISP, and companies can be notified if they are being spammed or phished.
Domain Assurance is currently in beta. Look for it to be commercially launched at the end of the third quarter.