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Concerns about “Author” Based MTA Registration
Administrative challenges for many usage scenarios
Imagine equivalent restrictions for postal mail or telephony
Does not work for mobile laptop, kiosks, other 3rd-parties
Not really “authentication” and not really useful beyond Spam
And deployment is expensive
Some proposals redefine email semantics
Mail-From, …
Sender re-writing
Limits ability to do real store-and-forward
Last MTA before receiver analysis must be Mail-From registered
“Policy” publishing service
Receivers cannot give highly differential handling in large scale
PPT Version