Viktor Dukhovni wrote:
Google and Microsoft deliver outbound mail for hundreds of thousands of domains from a common pool of outbound names. Nobody seems to mind.
Some of us do mind, but there's really nothing we can do about it because any spam-control measures we might try would block far too much mail that our customers want to receive.
Realistically, many other mail systems also relay mail on behalf of many apparently unrelated domains; it's rare to have a valid use case for really truly requiring mail for a given domain to be (apparently) running on its own dedicated system.
-kgd
