I'm adjusting mailman now to do this hoping that's it. It's on the privacy->sender tab. If you got unsubscribed from cisco-nsp or juniper-nsp this morning this is likely why. (ugh, 56 lists to adjust).. - Jared On Jul 9, 2014, at 10:32 AM, Matthew Black <Matthew.Black@csulb.edu> wrote:

If you find users being dropped from mailing lists, it's probably a DMARC issue. Contact your mailing list vendor for appropriate patches.

https://wordtothewise.com/2014/04/brief-dmarc-primer/ A brief DMARC primer

http://dmarc.org/overview.html DMARC Overview

http://www.socketlabs.com/blog/yahoo-com-changes-dmarc-policy/ Yahoo.com Changes DMARC Policy

http://yahoomail.tumblr.com/post/82426900353/yahoo-dmarc-policy-change-what-... Yahoo DMARC Policy Change - What Should Senders Do?

http://yahoo.tumblr.com/post/82426971544/an-update-on-our-dmarc-policy-to-pr... An Update on our DMARC Policy to Protect Our Users

http://www.lsoft.com/news/2014/listserv160-2014a-us.asp LISTSERV(r) Inventor Develops Seamless Solution to DMARC Hassles

matthew black california state university, long beach

-----Original Message----- From: NANOG [mailto:nanog-bounces@nanog.org] On Behalf Of Jared Mauch Sent: Wednesday, July 09, 2014 7:09 AM To: NANOG list Subject: hotmail email issues today?

Anyone know what happened? I've started to see a large number of bounces from them (this caused a large number of people with their e-mail hosted there to be removed from mailing lists I host).

Offlist replies/pointers to what I'm doing wrong are welcome.

- Jared

it's not clear (to me at least) that hotmail has deployed any DMARC config at all, actually: $ dig txt _dmarc.hotmail.com +short $ dig txt _dmarc.outlook.com +short no results... but: $ dig txt _dmarc.gmail.com +short "v=DMARC1\; p=none\; rua=mailto:mailauth-reports@google.com" On Wed, Jul 9, 2014 at 10:40 AM, Randy Bush <randy@psg.com> wrote:

...

If you find users being dropped from mailing lists, it's probably a DMARC issue. Contact your mailing list vendor for appropriate patches.

or let them drop and hopr they move to a standards-compliant email home. they're not called yahoos for nothing.

randy

On Jul 9, 2014, at 11:04 AM, Christopher Morrow <morrowc.lists@gmail.com> wrote:

it's not clear (to me at least) that hotmail has deployed any DMARC config at all, actually:

$ dig txt _dmarc.hotmail.com +short $ dig txt _dmarc.outlook.com +short

no results... but: $ dig txt _dmarc.gmail.com +short "v=DMARC1\; p=none\; rua=mailto:mailauth-reports@google.com"

I suspect they started checking DMARC in the past 24 hours. This impacts those who have "hotmail for their own domain" in addition to hotmail.com addresses. - Jared