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Re: [dmarc-ietf] From: munging, was Ratchets - Disallow PCT 1-99

John R Levine <johnl@taugh.com> Thu, 22 July 2021 19:51 UTC

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Date: Thu, 22 Jul 2021 15:51:25 -0400
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From: John R Levine <johnl@taugh.com>
To: Alessandro Vesely <vesely@tana.it>, dmarc@ietf.org
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Subject: Re: [dmarc-ietf] From: munging, was Ratchets - Disallow PCT 1-99
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On Thu, 22 Jul 2021, Alessandro Vesely wrote:
>>>  However, I'm not sure whether to actually RECOMMEND to do so.
>> That's simple: no.

> Yet, From: munging itself resulted from cooperation between dmarcers and MLM 
> people, didn't it?

No, it came from AOL and Yahoo unilateraly using DMARC to outsource the 
cost of their security breaches, with the entirely predictable (and 
predicted) effect of breaking every mailing list in the world.  List 
operators had to scramble and come up with some hack to mitigate the 
damage when I became clear that AOL and Yahoo did not care.

Regards,
John Levine, johnl@taugh.com, Taughannock Networks, Trumansburg NY
Please consider the environment before reading this e-mail. https://jl.ly

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