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Subject:	Re: DMARC - gmail.com or is it yahoo.com
To:	cygwin AT cygwin DOT com
References:	<90156ed9-3ba3-3563-5f90-b6424041acca AT gmail DOT com>
From:	David Macek <david DOT macek DOT 0 AT gmail DOT com>
Message-ID:	<24dbf7dd-8c45-b5cc-ad31-198ab61128ce@gmail.com>
Date:	Tue, 29 Nov 2016 17:19:29 +0100
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Content-Type: text/plain; charset=utf-8
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On 29. 11. 2016 15:24, cyg Simple wrote:
> I find this excerpt from cygwin-help a bit confusing.  Notice the
> "yahoo.com" in the "Remote host said:" message.  What's really going on
> here?  Why is yahoo.com doing the authentication for a gmail.com address?
>=20
> <excerpt>
> Received: (qmail 130602 invoked for bounce); 17 Nov 2016 10:26:04 -0000
> Date: 17 Nov 2016 10:26:04 -0000
> From: MAILER-DAEMON AT sourceware DOT org
> To: cygwin-return-205832- AT cygwin DOT com
> Subject: failure notice
>=20
> Hi. This is the qmail-send program at sourceware.org.
> I'm afraid I wasn't able to deliver your message to the following address=
es.
> This is a permanent error; I've given up. Sorry it didn't work out.
>=20
> <cygsimple AT gmail DOT com>:
> User and password not set, continuing without authentication.
> <cygsimple AT gmail DOT com> 173.194.202.27 failed after I sent the message.
> Remote host said: 550-5.7.1 Unauthenticated email from yahoo.com is not
> accepted due to domain's
> 550-5.7.1 DMARC policy. Please contact the administrator of yahoo.com
> domain if
> 550-5.7.1 this was a legitimate mail. Please visit
> 550-5.7.1  https://support.google.com/mail/answer/2451690 to learn about =
the
> 550 5.7.1 DMARC initiative. e69si30940847pfk.231 - gsmtp
> </excerpt>
>=20

Reading and understanding email bounces is notoriously hard.

I got the same email, just with my email address instead of yours. The prob=
lem is not related to the recipient's address, but to the sender's address.=
 A quick query to <cygwin-get DOT 205832 AT cygwin DOT com> got me the original messag=
e that bounced. Its headers follow.

> Date: Wed, 16 Nov 2016 04:25:22 -0500
> From: Ian Lambert <ian DOT lambert_42 AT yahoo DOT com>
> To: cygwin AT cygwin DOT com,Marco Atzeri <marco DOT atzeri AT gmail DOT com>
> Subject: Re: Resend: pdfseparate does nothing for me?
> Message-ID: <8C630CDB-03CD-4388-B8AC-7C2A033BEF67 AT yahoo DOT com>
> MIME-Version: 1.0
> Content-Type: text/plain; charset=3Dutf-8
> Content-Transfer-Encoding: quoted-printable

What happens is that ezmlm (the mailing list software) broadcasts this mess=
age (after adding a bunch of links at the bottom) to everyone subscribed, b=
ut with the sender unchanged. Yahoo has got a DMARC policy set up that is s=
upposed to ensure that only Yahoo servers can send messages marked as "from=
 ...@yahoo.com". As you can see, Google is enforcing the policy and correct=
ly rejecting the message as fake (it really wasn't sent by Yahoo, but by So=
urceware). This is only going to happen more and more often as email provid=
ers up the battle against spam.

The best solution is to change the way ezmlm re-sends the messages, I bet t=
here's a big discussion about it somewhere on the Internet.

--=20
David Macek


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