Re: (DMARC) We've been here before, was Why mailing lists

"John R Levine" <johnl@taugh.com> Thu, 17 April 2014 12:29 UTC

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Date: 17 Apr 2014 08:29:08 -0400
Message-ID: <alpine.BSF.2.00.1404170824350.2692@joyce.lan>
From: "John R Levine" <johnl@taugh.com>
To: "Pete Resnick" <presnick@qti.qualcomm.com>
Subject: Re: (DMARC) We've been here before, was Why mailing lists
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References: <CE39F90A45FF0C49A1EA229FC9899B0507D45766@USCLES544.agna.amgreetings.com> <20140414214949.32126.qmail@joyce.lan> <CE39F90A45FF0C49A1EA229FC9899B0507D460CB@USCLES544.agna.amgreetings.com> <alpine.BSF.2.00.1404142150430.32657@joyce.lan> <CAL0qLwbPMm_i0fqNSGQPv=xZaiNASy=icsRNudaNJ_3PNtX3Og@mail.gmail.com> <alpine.BSF.2.00.1404151832460.38826@joyce.lan> <CAL0qLwZUptJVw85T2FjB2HRGoOvcOUHKiQXeadM0QE9BsFVM9w@mail.gmail.com> <CAKHUCzxpwS+nR9wRGOzU_83f7XabMr0pwB5x-MHrqM-28r80kw@mail.gmail.com> <CAKHUCzzw9mufrTCOBQOkRrZU6wOM21X8Y=FUEKf=qnzS9VESjA@mail.gmail.com> <alpine.BSF.2.00.1404161654430.2065@joyce.lan> <534F1183.6060702@qti.qualcomm.com> <alpine.BSF.2.00.1404162346400.2194@joyce.lan> <534F5E67.1010307@qti.qualcomm.com>
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>> The magic token has to be cryptographically tied to the contents of the 
>> original message
>
> No it doesn't. It has to be cryptographically tied to the mailing list's 
> re-sending of the message. How to do that with asymmetric keys should be 
> discussed somewhere other than on this list.

Now I'm totally confused.  How does that help me as a sender distinguish 
between a good mailing list that is resending real mail from Yahoo and an 
evil mailing list that is sending phishes?

Regards,
John Levine, johnl@taugh.com, Taughannock Networks, Trumansburg NY
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