On 2015-11-24 13:43, Alvaro Herrera wrote:
Larry Rosenman wrote:
On 2015-11-24 13:11, Tom Lane wrote:
>Kevin Grittner <kgri...@gmail.com> writes:
>>On Tue, Nov 24, 2015 at 11:10 AM, Tom Lane <t...@sss.pgh.pa.us> wrote:
>>>>change the From header (and add a Reply-To, so replies still work).
>>If this were done, would the other steps (not changing the subject
>>or body of the email) be necessary?
>See my followup: I think it's probably true that we could skip those
>changes.  But Rudy commented that there's a lot of underdocumented
>subtlety here.  There might be reasons I'm missing why we'd need to
>stop doing those things.  It doesn't seem like DMARC as such would
>force that, but perhaps those things trigger some popular antispam

Any Header or Body changes will invalidate most, if not all, DKIM
signatures.  Since DKIM is used as part
of DMARC, it's a problem.

Not sure what MajorDomo2 will allow you to do.

We can turn off header and body changes easily enough, but changing the
"From:" address requires patching the Majordomo2 source code; and, as
you may already be aware, the maintainers gave up on Mj2 a decade ago,
so we'd be on our own for that.  I cannot promise any sort of timeline
for getting that done; and since that's an essential part of the recipe,
I don't see any point in doing the other changes either for the time

I think the breakage of DKIM signatures is already causing some pain
(though nowhere near the level of DMARC).

Of course, removing all the "List-" headers *and* our custom footers is
a huge step backwards in terms of mailing list functionality :-(  Also,
removing the [HACKERS] etc tags will annoy some people, for sure.
You don't have to remove the List- headers. DKIM says what headers it's using.

Larry Rosenman                     http://www.lerctr.org/~ler
Phone: +1 214-642-9640                 E-Mail: l...@lerctr.org
US Mail: 7011 W Parmer Ln, Apt 1115, Austin, TX 78729-6961

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