It appears that MCN-IETF <[email protected]> said:
>Hi,
>
>I have a "simple" question:
>
>Why should an intermediary that has not been authorized by either the sender 
>(e.g., an authorized outbound gateway) or the recipient
>(e.g., a recipient-controlled security gateway) be allowed to modify a message 
>while preserving an authentication result attributed
>to the original From domain for the modified, delivered content?

There is a common misconception that senders have some control over what
recipients do. That is 100% completely wrong, senders have NO CONTROL AT ALL
over what recipients do. You can publish your preferences, and recipients can
(and often do) ignore them.

Intermediaries will do what they do, and if you don't like it, your only
recourse is not to send them mail in the first place.

R's,
John
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