On Mon, Jul 12, 2021 at 2:41 PM Mark Fletcher via mailop <[email protected]> wrote:
> Hi Lena, > > On Mon, Jul 12, 2021 at 2:27 AM Lena--- via mailop <[email protected]> > wrote: > >> According to Юлия П. in Abuse Team Mail.ru, >> they'll not change their new unannounced policy: >> messages from mailing lists (at groups.io) from authors @yandex.ru >> are rejected by mail.ru though DMARC for yandex.ru is p=none. >> >> Thus, mail.ru became unusable for all people who participate >> in discussion mailing lists. >> >> I've changed it so that groups.io is now re-writing the From line for > all email we send to mail.ru, regardless of the sender's DMARC policy. > This will allow your mail.ru members to receive messages sent through us. > > Relatedly, it does seem like the expectation these days is for mailing > list software to re-write the From line when p=none (not just > reject/quarantine, which is what we currently do). It is not uncommon for > us to get enquiries from people setting up DMARC for their domains. They > start with p=none, see a bunch of reports about email sent through us > failing that, and then contact us about it, understandably thinking it's > something that they need to contact us about fixing before they move to a > more strict setting. For others here running mailing lists that pay > attention to DMARC settings, do you treat p=none differently than > reject/quarantine? > There are some disagreements about it. There are some domains which are marked p=none that have no plans to move to quarantine/reject, and obviously others that do. The experience with mailing lists rewriting from is less than perfect, though it's also probably only a small fraction of users who care one way or another. We split the baby with requiring p=quarantine pct=0 as a definitive next step to have the mailing list react, but apparently pct=0 isn't handled by everyone, so it will be equal to pct=100 for some. I guess one could potentially whitelist say the top N domains with p=none today (or if you have historical data, those who have been there for years) and let any new domains get rewriting. Which is another way of saying that you can capture the larger MSPs today which aren't likely to move (*cough* *cough* gmail), and the rest could be a coin flip but starting to move to the side of assuming anyone adding it now is doing so because they think they'll move to quarantine/reject. Brandon
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