[Mailman-Users] Emails from yahoo members, are getting rejected by yahoo, "Service Unavailable".

[Jim Popovitch]

On Sun, Apr 13, 2014 at 3:48 PM, Mark London <mrl at psfc.mit.edu> wrote:
> Hi - Starting this week, I've discovered that emails sent from yahoo members
> on my mailing lists, are not getting delivered to other yahoo addresses on
> my mailing list, including the person who sent the message.  My SMTP logs
> show that the message is getting rejected (see below).  I'm positive that
> the reason this is happening, is because I have my mailing list configured
> to preserve the original email address, in the From: line, while putting the
> mailing list address in the Reply-To:   If I specify that the mailing list
> address should also be in the From: address, the messages get delivered.
>
> I'm almost positive that Yahoo thinks that the message is spam, and
> rejecting it.  This is based on the fact that the same yahoo posts, when
> sent to Gmail members, are getting delivered to the Gmail user's Spam
> folder.  Gmail displays that the reason it's doing this, is that it can't
> verify that post is actually coming from yahoo.  This is a bit absurd, IMHO.
> But at least the message is getting delivered!  In the case of yahoo, they
> simply reject the message!
>
> Apr 13 15:30:05 mail1 sendmail[6367]: s3DJU4jS006361:
> to=<XXXXXXXXXX at yahoo.com>, delay=00:00:00, xdelay=00:00:00, mailer=esmtp,
> pri=208395, relay=mta5.am0.yahoodns.net. [98.138.112.38], dsn=5.0.0,
> stat=Service unavailable
>
> I would like to know if anyone else is seeing this behavior.  I've tried 2
> different mailing list servers, and I see the same behavior.  Thanks. - Mark

LOL, do you live under a rock?  :-)

The whole Internet is in a rage this week about this:

https://www.google.com/#q=yahoo+dmarc

-Jim P.