My personal policy is: only relay on national enterprises, possibly NOT much big, who happen to have a phone line with some humans on the other side. That's is.

My personal policy is: only relay on national enterprises, possibly NOT much big, who happen to have a phone line with some humans on the other side. That's is. A secondary policy is NOT relaying (as possible) on a single company. For domains that means use different companies on different domains and advertise up front your other domains on all of them as possible so third parties can know what to do if something goes wrong. Not complex, not complicated, not much expensive.