Exactly.  Here is another good article about this issue:  http://thehackernews.com/2014/04/yahoos-new-dmarc-policy-destroys-every.html

That link came from mailman's wiki:  http://wiki.list.org/DEV/DMARC
April 7, 2015
DMARC is what one might call an emerging e-mail security scheme.
There's a draft on it at draft-kucherawy-dmarc-base-04, intended for
the independent stream.  It's emerging pretty fast, since many of the
largest mail systems in the world have already implemented it,
including Gmail, Hotmail/MSN/Outlook, Comcast, and Yahoo.
ThinkTank is using version 2.1.17 of mailman so there are some built-in configurations that should be set, since this is what Yahoo and AOL are recommending to pass the DMARC test:  Rewrite (Munge) the From: header with the posters name 'via the list' and the list's address and merge the poster's address into Reply-To

-Jonathan

On 04/12/2015 09:46 PM, Mark Rehder wrote:
Yahoo changed their system last year, which caused problems.

https://blog.mailchimp.com/yahoo-changes-may-affect-your-deliverability/

Mark Rehder - Coordinator
re-Cycles Community Bike Shop

On 2015-04-12, at 6:17 PM, Godwin ! wrote:

I'm not sure why it was filtered. Has anyone else encountered the same problem?

In the meantime, try resending it and maybe forward the response you got directly to me so I might be able to look into it a bit more.

godwin


Date: Sun, 12 Apr 2015 18:06:58 -0400
From: danceswithcars@gmail.com
To: thethinktank@bikecollectives.org
CC: danceswithcars@gmail.com; thinktank-owner@bikecollectives.org
Subject: [TheThinkTank] Spam declared when I replied on a topic

Somehow my message was declared spam, and I've seen problems before with yahoo accounts (not mine), the message I was replying to, so heads up.  While extremely snarky, I don't believe it was spam, nor do I think I mistouched the damn tablet and declared it so, as the message says.
Caveat empor.

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