As someone who seems to be on the receiving end of endless amounts of casino spam emails from a company they host (mygoldenbonus), I've contacted their abuse email many times, and they do nothing to stop spammers.Update: So while Namecheap host the domain they don't provide the email service, so while they have helpfully led me to the provider of the email service, and told me the company involved isn't on any spam list, which is hardly surprising considering how hard it is to add one, I'm still unimpressed with the wild west nature.
