Scott Howard wrote:
> The idea of this header is that it will allow a sender to control that a
Sender has no control and asks a receiver perform some control,
which may be ignored by the receiver.
> user will only receive an email if that email address was valid before a
> specific date, thus at least stopping someone from using a recycled account
> to carry out a password reset on another service.
It does not work as protection against transferred domain.
> Facebook at least is already sending this header on all emails.
Someone might want people keep using mail services monitored by
USG.
Masataka Ohta
