Re: [Evolution] [Fwd: You have been unsubscribed from the evolution-list mailing list]

["Dr. John H. Lauterbach" <john lauterbachandassociates net>]

Hello Patrick,

I have resubscribed using one of my business addresses (IMAP) instead of address on bellsouth.net (POP)

-----Original Message-----

From: Patrick O'Callaghan <poc usb ve>

To: evolution-list gnome org

Subject: Re: [Evolution] [Fwd: You have been unsubscribed from the evolution-list mailing list]

Date: Sat, 30 Jul 2016 23:34:05 +0100

On Sat, 2016-07-30 at 22:54 +0200, Ángel González wrote:

On 2016-07-29 at 15:24 +0100, Patrick O'Callaghan wrote:


It's tempting to think so, but there are also users with pacbell and
bellsouth addresses who have similar problems. I note that both of them
route their mail through prodigy.net, if that means anything.

poc


Apparently, prodigy.net email service is actually provided by yahoo;
https://en.wikipedia.org/wiki/Prodigy_(online_service)#A_public_company


So it is really just yahoo having problems with emails from their own
customers that passed through a mailing list.


OK, good sleuthing :-)



I got the hint by the error message given by the prodigy mailserver
when attempting to spoof a yahoo From:


<<< 554 5.7.9 Message not accepted for policy reasons.  See 
https://help.yahoo.com/kb/postmaster/SLN7253.html
554 5.0.0 Service unavailable



I'm quite sure it is related to their DMARC reject policy (perhaps even
marked internally).


Looks like it, however I don't understand why it's only affecting a
very small number of users, and only occasionally.


It asserts that yahoo.com emails will only ever come from yahoo
servers, and non-complaint emails shall be *rejected*. This makes
complete sense for eg. paypal.com but for a free mail provider like
yahoo imho such policy is broken. Precisely because it completely
breaks mailing lists:
https://en.wikipedia.org/wiki/DMARC#Mailing_lists


Also, it should be noted that other providers may also be taking that
into account. For instance gmail accepts those DMARC-failing messages,
but they are sent to the Spam folder.


My address (@usb.ve) is a Google Apps for Education account. I have
another Gmail address on several Mailman lists. None of them has ever
been affected by this.


There are a few options in recent mailman versions for handling this,
although none seems specially appealing:
https://wiki.list.org/DEV/DMARC


I'll consider passing this on to the Gnome admins but it's seems likely
they would already know about it.

poc
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