Rackspace CDN domain blocked

A large group of our users cannot access our content because they use Norton Safe Web. Norton Safe Web has blocked rackcdn.com which is the CDN domain of Rackspace. I have notified Rackspace but they are reluctant to fix this issue.

Is there any chance you could unblock the rackcdn.com domain? The reported threats are located on a subdomain. Each user has a random generated subdomain on rackcdn.com and this one subdomain can be blocked in order to keep users safe: fbdca1aa8b880016bf93-fe8db8e793d145b7a307239462d85480.r72.cf5.rackcdn.com

I am not a site owner thus I cannot follow the steps to get reevaluated.