I keep my portfolio of domain names at GoDaddy, and I have DTVS security enabled on my account. Domain Sherpa wrote about DTVS, but in short, when I push a domain name to another GoDaddy account or someone starts a transfer of my domain name to another domain registrar, I have to approve the change via phone call.
With Afternic’s Fast Transfer service enabled, GoDaddy’s DTVS is overridden. When someone buys a Fast Transfer-authorized domain name through the Afternic network, the domain name is automatically pushed or transferred without the DTVS phone call since the Fast Transfer was previously authorized by the seller.
In light of the ongoing issue with the Fast Transfer authorization emails, I think GoDaddy should allow customers with DTVS to have that override Fast Transfer approval.