Mailing List Message #104897
From: Michael Wise <>
Subject: Yahoo's New DMARC Policy Destroys Mail Lists
Date: Wed, 09 Apr 2014 22:58:42 -0700
To: CommuniGate Pro Discussions <>
Beginning Saturday evening I started noticing messages sent from
* addresses to various CGP mail groups containing *
forwarders started bouncing. This has continued through today with
messages (always from * now bouncing to,,, and

If you've also noticed a lot of bounces involving addresses in your CGP
mail groups in the last few days, here's why:

Apparently, Yahoo changed its DMARC policy p=reject this past week-end
which has had a very negative impact on millions of mail lists around
the world.


[for the geeky but authoritative explanation]

This is an extremely ill thought-out thing Yahoo has done. It has had a
very noticeable negative impact world-wide. It remains to be seen
whether they will do the right thing and backtrack.


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