On Tue, 25 Jun 2013 18:22:22 +0100 Jim Reid <j...@rfc1035.com> wrote:
> On 25 Jun 2013, at 18:01, "John Levine" <jo...@iecc.com> wrote: > > > There is a somewhat popular convention that if a domain publishes an > > MX like this: > > > > whatever.example MX 0 . > > > > it means the domain does not receive mail. > > Well yes. But it only "works" as long as there are no A or AAAA records for . > in the root zone. If that was ever to change, anyone who adopted this Bad > Idea will be in for a nasty surprise. It's useful for rejecting email that purports to be from that domain.... [snip] -- John GPG Public Key: 412934AC
