Yahoo is now recycling handles

Wed Sep 4 08:50:20 UTC 2013

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