Gilles, I think you will get much background document from https://blogs.msdn.microsoft.com/tzink/2014/12/03/using-dmarc-in-office-365/
What Microsoft does differently with DMARC, is that instead of rejecting the email it should reject, it accepts them and deliver them to the junk folder in the highest form of protection. Now, mailing lists break DMARC (or DMARC break mailing lists, but let's not get into philosophy). There are a few options for you that are described in: https://tools.ietf.org/html/draft-ietf-dmarc-interoperability-18 Basically what works today you can do: -Do not break the DKIM of the poster -Change the From: header to put the email of the list instead of the poster -reject email from someone posting from a DMARC protected domain There are a few things that may work tomorrow, like ARC. As your volume is low, MS may not be able to detect it is a mailing list and decide to overwrite the DMARC policy. On Wed, Sep 21, 2016 at 6:56 AM, Gilles Chehade via mailop < mailop@mailop.org> wrote: > On Wed, Sep 21, 2016 at 01:54:43PM +0000, Michael Wise wrote: > > > > If it's Hotmail, it's almost certainly an IP specific issue. Open a > ticket.... > > > > ok thanks ! > > > > ________________________________ > > From: Gilles Chehade<mailto:gil...@poolp.org> > > Sent: ?9/?21/?2016 6:31 AM > > To: Michael Wise<mailto:michael.w...@microsoft.com> > > Cc: Steve Atkins<mailto:st...@blighty.com>; mailop<mailto:mailop@mailop. > org> > > Subject: Re: [mailop] anyone from Microsoft around ? > > > > On Wed, Sep 21, 2016 at 01:16:47PM +0000, Michael Wise via mailop wrote: > > > > > > The headers in particular. > > > > sent in another mail to the thread the two pastebins > > > > > And is this to Hotmail, et al or Office365? > > > > > > > only complaints i've received where about hotmail and this is where I > > reproduce the issue with other members of my community right now. > > > > I honestly have no idea about Office365 :/ > > > > > > > > > Aloha, > > > Michael. > > > -- > > > Sent from my Windows Phone > > > ________________________________ > > > From: Steve Atkins<mailto:st...@blighty.com> > > > Sent: ?9/?21/?2016 5:56 AM > > > To: mailop<mailto:mailop@mailop.org> > > > Subject: Re: [mailop] anyone from Microsoft around ? > > > > > > > > > > On Sep 21, 2016, at 4:02 AM, Gilles Chehade <gil...@poolp.org> > wrote: > > > > > > > > > > > > I'm wondering if there is something wrong in the format of our > headers > > > > and if this could affect users of our software disregarding the kind > > > > of mails they send with it. I've been tackling this for hours before > > > > contacting the mailing list. > > > > > > > > Any help would be greatly appreciated, I'm running out of ideas :-) > > > > > > Sharing a sample of those headers on a paste site (and maybe > > > a protocol level trace of a failing transaction) might get you some > > > feedback on whether anything looks off about them. > > > > > > Cheers, > > > Steve > > > > > > > > > _______________________________________________ > > > mailop mailing list > > > mailop@mailop.org > > > https://na01.safelinks.protection.outlook.com/?url= > https%3a%2f%2fchilli.nosignal.org%2fcgi-bin%2fmailman% > 2flistinfo%2fmailop&data=02%7c01%7cmichael.wise%40microsoft.com% > 7c7b9c6ad2ee9b4a4e6b4f08d3e21ec293%7c72f988bf86f141af91ab2d7cd011 > db47%7c1%7c0%7c636100594149963484&sdata=XtboHW2aVAEav7gFT65xCVy%2bk% > 2befTPXCdBNQbBIL5Zs%3d > > > > > _______________________________________________ > > > mailop mailing list > > > mailop@mailop.org > > > https://na01.safelinks.protection.outlook.com/?url= > https%3a%2f%2fchilli.nosignal.org%2fcgi-bin%2fmailman% > 2flistinfo%2fmailop&data=02%7c01%7cMichael.Wise%40microsoft.com% > 7cd385a151ed9a43a298a108d3e22393f2%7c72f988bf86f141af91ab2d7cd011 > db47%7c1%7c0%7c636100614857988937&sdata=LqM2MVNcK6DP3g8gDG1K7gKfsGPdbQ > Linx4zViyJ%2bRM%3d > > > > > > -- > > Gilles Chehade > > > > https://na01.safelinks.protection.outlook.com/?url= > https%3a%2f%2fwww.poolp.org&data=02%7c01%7cMichael.Wise%40microsoft.com% > 7cd385a151ed9a43a298a108d3e22393f2%7c72f988bf86f141af91ab2d7cd011 > db47%7c1%7c0%7c636100614857988937&sdata=CgcRCVjKyFGk5aO21jd1ju25EhvMk6 > 5XZYOxcPZFVGY%3d @poolpOrg > > -- > Gilles Chehade > > https://www.poolp.org @poolpOrg > > _______________________________________________ > mailop mailing list > mailop@mailop.org > https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop >
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