On Fri, 1 Jul 2016, Chris Adams wrote:

Once upon a time, Ed Greshko <ed.gres...@greshko.com> said:
No, it isn't specifically a Gmail issue, it is an issue from the
combination of DMARC strict policies, sites that enforce DMARC policies,
and mailing lists.

Yahoo publishes DMARC policies that say messages from a Yahoo domain in
the From: header should only come from the Yahoo servers.  Gmail (and
other sites) recognize and follow those policies.  When a Yahoo user
sends email to a mailing list, and the list server resends the message,
it doesn't come from a Yahoo server, so sites that follow DMARC policies
reject the message.

The correct solution is for the mailing list software to be changed to
rewrite From: addresses.  Newer versions of Mailman support this.  The
address rewriting is annoying, but is the only true solution to being in
between sites that publish and honor DMARC policies.


Yeah, this was a big issue on another mailinglist I belong to (NAME-L at Emory 
U).  We had a bunch of people who simply disappeared from the list for a couple 
of months.  Then they all reappeared with obviously re-written addresses.

That meant that none of them could get backchannel responses by just choosing "reply" 
because Emory didn't decode the addresses for response in a reply.  Since that list is associated 
with an organization that keeps a list of public email addresses of members, the workaround was to 
have to look up the address if you wanted to respond individually.  But that doesn't happen much.  
All in all, it turned out to be a blessing in disguise because a lot of people were in the habit 
hitting "reply all" and posters would get two responses -- one to the mailinglist and one 
personally.  And it turned out that most of the people who were either offenders *or* victims of 
the double mails were mostly Yahoo/Gmail folk.  Win. win.


billo
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