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
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-should-senders-do
Yahoo DMARC Policy Change - What Should Senders Do?
http://yahoo.tumblr.com/post/82426971544/an-update-on-our-dmarc-policy-to-protect-our-users
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
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
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
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"
Don't let that stop others from offering leftfield advice. 
According to MailOP, Yahoo had acceptability issues as well this AM.
-Jim P.
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