I can imagine more Yahoo users experiencing trouble. Yahoo has the nasty tendency to mark its emails to a mailing list as 'spam'. This is a problem that has been around for two years, and it's surprising Yahoo still hasn't worked on solving it: http://www.pcworld.com/article/2141120/yahoo-email-antispoofing-policy-breaks-mailing-lists.html

Most likely, also the other list members (if they use providers like gmail) will experience that these emails from those Yahoo senders will end up in their spamfilter. This way, even Jimmy Wales ends up in our spamfilters when he emails wikimedia-l. 

Not sure if there is a solution, and what it would be. 

Good luck,
Lodewijk

2016-10-04 9:54 GMT+02:00 R. Acconish <racconish@gmail.com>:
Hello,

As you can see from the headers below, 3 members from the French Arbcom, including an administrator of the list, have been removed automatically from the list. This seems to be due to the fact their email account is at Yahoo. We never had the problem before. What do you advise us to do ?
Thanks in advance,
Racconish

---------- Message transféré ----------
De : <mailman@lists.wikimedia.org>
Date : 4 octobre 2016 à 08:59
Objet : Bounce action notification
À : car-fr-l-owner@lists.wikimedia.org


Ceci est un avis d'erreur sur une liste Mailman:

    Liste:      Car-fr-l
    Abonné:     thouny32167@yahoo.fr
    Action:     Abonnement disabled.
    Raison:     Rejets excessifs ou fatals.



Ce qui a déclenché l'envoi de cet avis est joint ci-dessous.

Des questions ? Contactez l'administrateur du site Mailman à
l'adresse mailman@lists.wikimedia.org.


---------- Message transféré ----------
From: Mail Delivery System <Mailer-Daemon@fermium.wikimedia.org>
To: car-fr-l-bounces@lists.wikimedia.org
Cc: 
Date: Tue, 04 Oct 2016 06:55:04 +0000
Subject: Mail delivery failed: returning message to sender
This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

  benoit.othello@yahoo.fr
    SMTP error from remote mail server after end of data:
    host mx-eu.mail.am0.yahoodns.net [188.125.69.79]:
    554 5.7.9 Message not accepted for policy reasons.  See https://help.yahoo.com/kb/postmaster/SLN7253.html
  wikangadoba@yahoo.fr
    SMTP error from remote mail server after end of data:
    host mx-eu.mail.am0.yahoodns.net [188.125.69.79]:
    554 5.7.9 Message not accepted for policy reasons.  See https://help.yahoo.com/kb/postmaster/SLN7253.html
  thouny32167@yahoo.fr
    SMTP error from remote mail server after end of data:
    host mx-eu.mail.am0.yahoodns.net [188.125.69.79]:
    554 5.7.9 Message not accepted for policy reasons.  See https://help.yahoo.com/kb/postmaster/SLN7253.html

<snip>

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