]
] 24) Again, how will you stop spammers from forging this
] domain?
] Nothing can stop a spammer from forging a .mail
] domain, but the entire TLD DNS system - the thing that
] controls all domains under this TLD - is run by the
] Sponsor Organization. What this means is that a system
] that tests to see if the connecting .mail domain is a
] valid, "no spam" domain, will be able to spot an attempt
] to forge it right at the start of the SMTP transaction.
] Attempts to forge can be rejected on the spot, or passed
] on to further spam-filter checks.

They need to publish a RFC-level document detailing how this
would work. I think they're saying a mail from amazon.com
would have an envelope sender of mx23.amazon.com.mail. The
receiving MTA can then check that the connecting host really
is mx23.amazon.com and if so, let the mail through.