I have reverted to the IP address lookup and email request, through absolute frustration.
As someone who works in the IT industry I have to call bullshit on Marks (or who ever owns the site) website hosting provider.
They are either inbreds who are ultra... Conservative or something very dodgy is going on with their business model or technical imfrastructure and they are making up bull shit for limiting traffic to his site.
A so called Linux vulnerability, while incredibly rare (unless Bill gates has brought them) and unlikely should be ok if they have a basic firewall and DMZ in place. Something that your average Australian small business has folks.
Again If mark is reading this then I sincerely suggest you quickly change host and open the site back up to the rest of the world.... Before the whole thing falls over and before you go crazy with email requests...