I'm using namecheap right now for all my domains, and I just set up my mailserver with namecheap domains under the same account... but then I thought: what happens if I get a spam complaint on one of my domains? Do they shut down the domain? Do they shut down ALL the domains in the account!? So what are the best domain registrars to use for can-spam mailing? Ones that ideally do not shut down the domain at all, but at least would not shut down ALL the domains in your account?