Re: [dmarc-ietf] Header Rewriting
Douglas Foster <dougfoster.emailstandards@gmail.com> Wed, 06 January 2021 23:33 UTC
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From: Douglas Foster <dougfoster.emailstandards@gmail.com>
Date: Wed, 06 Jan 2021 18:32:55 -0500
Message-ID: <CAH48Zfyf=NV0dJJZzG7bPKSro1hd1q=4eGQLBkDG1oo4XU3dXw@mail.gmail.com>
To: Laura Atkins <laura@wordtothewise.com>
Cc: IETF DMARC WG <dmarc@ietf.org>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/dmarc/bjdoctfHA3AKuPEqvDRhjhRQnYQ>
Subject: Re: [dmarc-ietf] Header Rewriting
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A previous attempt at this reply was sent prematurely. Sorry about that. I said: Forwarding hides information that the email filter needs to make a correct decision. Header rewrite hides the problem, but does not solve it. When we get the automation right, predicting user behavior will not be necessary. Laura replied: You’re going to need to provide evidence this is the case. Happy to explain, but I have been saying as much for some time. My source filtering uses five parameters: Source IP, Reverse DNS of the Source, Helo name, SMTP address, and From Address. Assuming that a forwarder adds no threat content, the need to evaluate the actual source remains. But this is difficult to do: -- Forwarding hides the three elements of server identity behind the forwarding server. -- SMTP rewrite hides the source domain identity, such as the ESP which sent the message. -- From rewrite hides the asserted author identity. We have hidden everything. If the forwarder could be trusted to block all spam, this might not be a concern. But everybody assesses spam differently and everybody misses some of it. As a group, forwarding services have an incentive to minimize false positives, so the likelihood of spam getting through is high. Mailing lists have different incentives, and should be able to block spam reliably. Whether they do so or not is outside my experience. > >
- [dmarc-ietf] Ticket #55 - Clarify legal and priva… Alessandro Vesely
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… John Levine
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Alessandro Vesely
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… John R Levine
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Seth Blank
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Alessandro Vesely
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… John Levine
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Alessandro Vesely
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… John R Levine
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Alessandro Vesely
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… John R Levine
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Alessandro Vesely
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… John R Levine
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Alessandro Vesely
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… John R Levine
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Alessandro Vesely
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Michael Thomas
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… John R Levine
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Alessandro Vesely
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Michael Thomas
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Alessandro Vesely
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Kurt Andersen (b)
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Michael Thomas
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Alessandro Vesely
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Alessandro Vesely
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Dotzero
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… ned+dmarc
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… John R Levine
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Kurt Andersen (b)
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Murray S. Kucherawy
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… John R Levine
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… ned+dmarc
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Murray S. Kucherawy
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Dotzero
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… John R Levine
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Tim Wicinski
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Alessandro Vesely
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… John R Levine
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Alessandro Vesely
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Todd Herr
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Dotzero
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… ned+dmarc
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Todd Herr
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Michael Thomas
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Tim Wicinski
- Re: [dmarc-ietf] reporting documents, Ticket #55 … John R Levine
- Re: [dmarc-ietf] reporting documents, Ticket #55 … Tim Wicinski
- Re: [dmarc-ietf] reporting documents, Ticket #55 … Seth Blank
- Re: [dmarc-ietf] reporting documents, Ticket #55 … Michael Thomas
- Re: [dmarc-ietf] reporting documents, Ticket #55 … John Levine
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… John Levine
- Re: [dmarc-ietf] reporting documents, Ticket #55 … Hector Santos
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Alessandro Vesely
- Re: [dmarc-ietf] reporting documents, Ticket #55 … ned+dmarc
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Todd Herr
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… John Levine
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Murray S. Kucherawy
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Alessandro Vesely
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Alessandro Vesely
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Michael Thomas
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… ned+dmarc
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Michael Thomas
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… ned+dmarc
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… John Levine
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Michael Thomas
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Michael Thomas
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Alessandro Vesely
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… John Levine
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Michael Thomas
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Douglas Foster
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… John Levine
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Jim Fenton
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Laura Atkins
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Alessandro Vesely
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… John Levine
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… John R Levine
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Alessandro Vesely
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… John R Levine
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Alessandro Vesely
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Alessandro Vesely
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Alessandro Vesely
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… John R Levine
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Michael Thomas
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Alessandro Vesely
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… John Levine
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Douglas Foster
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Dave Crocker
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Alessandro Vesely
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Alessandro Vesely
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… John R Levine
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Douglas Foster
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Alessandro Vesely
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Alessandro Vesely
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Laura Atkins
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… John Levine
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Dave Crocker
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Michael Thomas
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Alessandro Vesely
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Douglas Foster
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Jim Fenton
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Paypal security confirm your password now
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Kurt Andersen (b)
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Jim Fenton
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Dave Crocker
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Michael Thomas
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Dave Crocker
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Michael Thomas
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Dave Crocker
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Michael Thomas
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Dave Crocker
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Michael Thomas
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Dave Crocker
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Michael Thomas
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Dave Crocker
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Michael Thomas
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Dave Crocker
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Michael Thomas
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Dave Crocker
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Michael Thomas
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Dave Crocker
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Douglas Foster
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Michael Thomas
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Dave Crocker
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Michael Thomas
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Dotzero
- Re: [dmarc-ietf] Header Rewriting Laura Atkins
- Re: [dmarc-ietf] Header Rewriting Douglas Foster
- Re: [dmarc-ietf] Header Rewriting Laura Atkins
- Re: [dmarc-ietf] Header Rewriting Dave Crocker
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Michael Thomas
- Re: [dmarc-ietf] Header Rewriting Michael Thomas
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Dotzero
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Michael Thomas
- Re: [dmarc-ietf] Header Rewriting Michael Thomas
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Dotzero
- Re: [dmarc-ietf] Header Rewriting Laura Atkins
- Re: [dmarc-ietf] Header Rewriting Michael Thomas
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Michael Thomas
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Murray S. Kucherawy
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Dave Crocker
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Dave Crocker
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Michael Thomas
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Dave Crocker
- Re: [dmarc-ietf] Header Rewriting John Levine
- Re: [dmarc-ietf] Header Rewriting Douglas Foster
- Re: [dmarc-ietf] Header Rewriting Douglas Foster
- Re: [dmarc-ietf] Header Rewriting Douglas Foster
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Alessandro Vesely
- Re: [dmarc-ietf] Header Rewriting Alessandro Vesely
- Re: [dmarc-ietf] Header Rewriting John Levine
- Re: [dmarc-ietf] Ticket #55 - Clarify legal and p… Dave Crocker