How can I receive Splunk security announcements via email?

I see that Splunk 5.0.3 was released a few days ago to resolve some security issues. I was unaware of this security update until my security team informed me of a security notice passed on via CERT.

http://www.splunk.com/page/securityportal tells me that I can receive security alerts via RSS:

Stay up to date on security announcements. Subscribe to our RSS feed to be alerted of new announcements.

In addition, my Splunk installation is not informing me of a new release.

I don't use RSS feeds, nor do most people. How can I receive security alerts via email?