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[ietf-dkim] Re: Message Replay Abuse and Acceptance of a Signature

2006-01-22 02:43:51
Douglas Otis wrote:

A Low Administrative Solution Insensitive to High Latency:
 
Just as email domains check lists when deciding to receive a
message, they now also check a list to decide whether to
sign, or perhaps even send a message.
 
With this paradigm, as a best practice, to ensure Company X
that it is safe for them to send their newsletter, Domain Z
replaces the incoming signature with an MDA specific
signature at the edge of their AdmD.  An MDA specific
signature can not be used to resend a message, but still
allows users of Domain Z to be assured the message is valid, 
and the completed by Domain Z when the message first arrived.

Any sender X arranges something with most of its receiving Zs.
Any receiver Z arranges something with most of its inbound Xs.

Why do they need DKIM for that ?  CSV or SPF should be enough.

                          Bye, Frank


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