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Re: [dmarc-ietf] non-mailing list use case for differing header domains

Jim Fenton <fenton@bluepopcorn.net> Tue, 04 August 2020 15:34 UTC

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To: John R Levine <johnl@taugh.com>, "Murray S. Kucherawy" <superuser@gmail.com>
Cc: IETF DMARC WG <dmarc@ietf.org>
References: <20200802165756.3892C1DC82FD@ary.qy> <719dce3edbc54b25b6ebf248170e7eb2@bayviewphysicians.com> <CAL0qLwYFoGHL13tLOnbgf97qtgLFDo4AmutZdQvMVsuX56Vz0Q@mail.gmail.com> <f9967c0-1f1d-217f-7d6-a8ee1321e68@taugh.com>
From: Jim Fenton <fenton@bluepopcorn.net>
Autocrypt: addr=fenton@bluepopcorn.net; prefer-encrypt=mutual; keydata= mQINBFJNz0MBEADME6UoNSsTvSDJOdzL4yWfH4HTTOOZZPUcM/at38j4joeBb2PdatlwCBtk 9ZjupxFK+Qh5NZC19Oa6CHo0vlqw7V1hx1MUhmSPbzKRcNFhJu0KcQdniI8qmsqoG50IELXN BPI5OEZ3chYHpoXXi2+VCkjXJyeoqRNwNdv6QPGg6O1FMbB+AcIZj3x5U18LnJnXv1i+1vBq CxbMP43VmryPf8BLufcEciXpMEHydHbrEBZb/r7SBkUhdQXjxRNcWOLeYvOVUOOrr1c+jvqm DEbTWUJVRnUro/WpZQBffFnymR0jjkdAa8eOVl/nF2oMLbaBsOMvxCRSSEcGhuqwbEappNVT 1nuBTbkJT/GGcXxc+lEx9uNj86oYC4384VZJMTd1BRI4qPXImNZCIdmpKegK743B6xxN6Qh1 Tg167pn9429JENQE/AFIVX5B/gpsg7Aq+3rmz9H6GbfovPvFV3TBTgsHCHAMC8XU+S4fhcqN PN0lbUeyb7g6wxaE+dYqC7TExx7G3prw4v66y0qS7ow/Cfw8XXOEkaFQ4XwP7nvfILT+9CcU yS8I40vlDFU9Wnt56CbGz0ZVQgHnwyPXL+S9kCcIwRLFx1M79s6T6qwX1TXadfpbi1uIw7XG TiPDT8Pk6i2y22oSSROyYD4D+wOhVkkvO0S8iZ3+LhAYUx86nwARAQABtCNKaW0gRmVudG9u IDxmZW50b25AYmx1ZXBvcGNvcm4ubmV0PokCVQQTAQgAPwIbAwYLCQgHAwIGFQgCCQoLBBYC AwECHgECF4AWIQS1nUkJe2fEXbvBaacbJaiwFdCfvgUCXxoIpQUJEI6gYAAKCRAbJaiwFdCf voc0EACDpkdX086xmst9QgccOX2qKPnzbaAa0/NpFtJN860Us5gbv8gf+9Wfkz0UVqmExp3a 7CMzJnH5CLNb4jOXMMMoFCzJ8UioTGL4jwN23wXHdhOEycnKMl2i2bN13DwEWdrqVHzF2ds8 did+0Ep1deFCGAEXTS5QMc2LyPynMGScHcLTZJ6IIBK9sQqGn9IPR4UjiZOV4382RG86jxam G8EhKTahaJF+srqXsmKdfg1xGDUr0aFfPZQcdpE/cBePMqe4+H6py4eEobcuVD61RL8KTj3D F78TkoR7+RJcPvTGEA3I5kNPLQrqtSFhds327Mr6MzDkC4gg5nIhvWb/j2zn4tfckBY+e9vS nq6Hfo0NYbqWYaHSdvA0bF7D9CPJ4sXco7MCx1/nLYYLNHpxnSMAFPZmI3lMQBGcR89c/sBm K7BA4aotgbxfm/fZNngZB0xFolkXyPIBfR9rzgIY2llSdd+KlN5tjZnQ7QkShWp0iG2YI6nC Zr7HaObdp+aRB5UmkD5GOdPMcv7s5esouysTKu2R2nzPQG0atMiSRtS6QEDmp372TG7L2w4V HVLx5wlrWpoTiKAMwg7VtFjD7Xbyho6NgRrrmhiW7KnIQxYrb6evg4v316E+H0w0ogU/fDMF x3ZnZDC6npTuPT4GojlxIANBQmSKHYX66HD291b7WrkCDQRSTc9DARAAwZaXYs3OzGlpqvSH 3HR9GjSzIeP0EmsBCjpfIdZbQBwQ3ZREiMGInNxV+xkdjLDg0ctrWzUCUe3plWe5NJkpjqm+ KMc7GKhyeWJ5MZRtVrh0VpFTqi8UwYPWumAYqE1y/U1me/zHpfG9EDwdSYqMkPF76Fy5W+vh ZP2ILKaY8qWSLyH8TPl5mFGBypfT8Q6UuzlRs2aTbsTtBX/qwH7gztMRJSjQtYo20AqCgBBH IA/0xV5qDH7CVYyKyPQ4tJLQ8/xyTysUS5fewrj8lZo/G9SaNtC3CEvrJYwyA0nvYB6+hJPM qMP/tyRXM/9XY3qO4Vxuc+m5fYbTZa5GYAZNNuB5dvqI1U0sFTWBEbpAeabqCQ40ZnFSj+t1 tBuwfj4ey/oJ78WRyg5+VTvPKRRubOmZcnzj5yfTS3VGxAZb4Nsj1S2f3KLP0Z+Cv4dt893I 2JWTChw7jA1omF0QTQaBq140n084PFndBHudrZ3cz+APC89iie2HQ4jGQldXZXnGySHnHlA+ WUyZ9wgOplW9F4Q/Lps1bnuh5VttPVpNfjX8hiV48al+b+ut4nfzXAripIRWF3TL72/6JqgE KNhRKyRn0S6BidieSyHWzqJR3Roi/YNTvyXyLh6i6jtByb3FbnhYf/9olobDpj0E+kTemLrw owre85gwupSphqlzVSUAEQEAAYkCPAQYAQgAJgIbDBYhBLWdSQl7Z8Rdu8FppxslqLAV0J++ BQJfGgilBQkQjqBiAAoJEBslqLAV0J++j7cP/jEq8IXTyahDSPJxQpMKVDL24OBhgZZdmt8B AWFUIrlnaucZ8BXW8wYFnFr+76gSKkfArAXcxSol32aMKS3fW8EdIDw7nkdPuKJGY6dhzIZ5 HDRq/jNMLYHcqXB+0YuqpZ4VNGL3/gmgduBgyTx/cnfqOe7WG13V4qFRMNIrdsf2QdAeFl93 MirVJpokH3anHeh8fQkpWSCiIP7ejGN3Lld1pWdGXqpubj5z6R5208/acSpVs79JiQfaH3q0 cau9oYX0JRoW6iQpGNXlkfLFehCzsKks/m4CtMXMXtajakBmWuHxuebcfHpmz6F+9B3rHvai 5TjSmZe9KfjlDAsuksq4CP1kJOqTxg+e0Sup38b0C979lHpRIhwwl0znobT9EPnrjMd5yDZt 2CZGEAE0bzXWLSHcRDJnHu+jscCnowC18S7LL3X9Gmw8r+WUYmMQ0A8ZDDOB8Z5p9PIs2OAQ kBBsBWFb59KGjtAvFWFEm6/DRDlzXmANICwHC2G4aqn1G3DLSDzwfBfSYLs31dK5mDyzv51G ZJfgxbwTKcdoy6AEkUrzM3A1GP+NVfb/I2LCui+QOHfhfPFmV1OPpTPL77AsTXviA7l1iYMd BADv28GwZyay6Fd1Hp7rOXFI/Qx87++GwpEjpuSKcZihfnh2754ZSyZxim2wmMs6k12nYwvE
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Date: Tue, 04 Aug 2020 08:33:35 -0700
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Archived-At: <https://mailarchive.ietf.org/arch/msg/dmarc/rZNSj3kH8ojh2RqHIarW3qITQuQ>
Subject: Re: [dmarc-ietf] non-mailing list use case for differing header domains
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On 8/2/20 2:24 PM, John R Levine wrote:
>>> If they would provide a way to register a mailing list and the servers
>>> from which it comes, and allow DMARC exceptions for traffic from those
>>> registered lists, your situation would be much easier?
>
> If large mail providers were willing to whitelist known mailing lists
> we wouldn't need ARC.

And as has been pointed out (perhaps also by John), ARC still requires
an allowlist or some other way to determine who is allowed to make
authenticated changes to a message.

-Jim

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