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Re: {OT] Mailing lists etc for postmasters

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On Fri 01/03/2024 at 09:18, Andy Smith <andy@strugglers.net> wrote:

> Just for the record, the Authentication part of DMARC is done with
> SPF and/or DKIM; the large mailbox providers actually (since 1 Feb)
> require *either* SPF *or* DKIM passes, or both if you are a bulk
> sender (thousands of mails per day).
>
> DMARC itself remains optional (but recommended) and once taken
> separately from SPF and DKIM is mainly a reporting mechanism.

https://support.google.com/a/answer/81126?hl=en#requirements-5k&zippy=%2Crequirements-for-sending-or-more-messages-per-day%2Crequirements-for-all-senders

mentions DMARC in requirements for all senders:

"Don’t impersonate Gmail From: headers. Gmail will begin using a DMARC quarantine enforcement policy, and impersonating Gmail From: headers might impact your email delivery."

but only explicitly requires it in requirements for senders of >5,000 messages a day:

"Set up DMARC email authentication for your sending domain ..."

...which is not quite as clear as it might be.

Can a "DMARC quarantine enforcement policy" operate, if the sender doesn't use DMARC?  This idea seems to relate more to SPF than anything?

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Thread

{OT] Mailing lists etc for postmasters "Gareth Evans" <donotspam@fastmail.fm> - 2024-03-01 02:50 +0100
  Re: {OT] Mailing lists etc for postmasters <tomas@tuxteam.de> - 2024-03-01 06:50 +0100
    Re: {OT] Mailing lists etc for postmasters Michael Grant <mgrant@grant.org> - 2024-03-01 09:30 +0100
      Re: {OT] Mailing lists etc for postmasters tomas@tuxteam.de - 2024-03-01 09:50 +0100
  Re: {OT] Mailing lists etc for postmasters Marco Moock <mm@dorfdsl.de> - 2024-03-01 09:30 +0100
  Re: {OT] Mailing lists etc for postmasters Andy Smith <andy@strugglers.net> - 2024-03-01 10:20 +0100
    Re: {OT] Mailing lists etc for postmasters "Gareth Evans" <donotspam@fastmail.fm> - 2024-03-01 12:10 +0100
      Re: {OT] Mailing lists etc for postmasters Andy Smith <andy@strugglers.net> - 2024-03-01 12:20 +0100
        Re: {OT] Mailing lists etc for postmasters "Gareth Evans" <donotspam@fastmail.fm> - 2024-03-01 12:30 +0100
      Re: {OT] Mailing lists etc for postmasters "Gareth Evans" <donotspam@fastmail.fm> - 2024-03-01 12:20 +0100

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