On Mon 21/Jul/2014 16:14:57 +0200 MH Michael Hammer (5304) wrote:
From: ietf-smtp On Behalf Of Dave Crocker
This specification does not deal with the verification of return
paths for use in delivery notifications. A server MAY attempt to
verify the return path before using its address for delivery
notifications, but methods of doing so are not defined here nor is
any particular method recommended at this time.
Various mechanisms exist for verifying identities of different
actors involved with the handling a message, including TLS, SPF
 and DKIM  , OpenPGP, S/MIME.
[...] this is the best proposal I've seen so far.
+1, for the sake of inter-domain notifications.
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