I use Yahoo mail (w7zrc@yahoo.com) and got the message for both Ten Tec and
Towertalk reflectors. I did the "return of the message for confirmation" for
both reflectors and now both are working and I haven't seen the error message
again. Maybe I am lucky? Seemed like an easy fix.
73,
Rod
________________________________
From: Al Kozakiewicz <akozak@hourglass.com>
To: TT TowerTalk <TowerTalk@contesting.com>
Sent: Monday, April 14, 2014 2:36 PM
Subject: Re: [TowerTalk] Bounces
DMARC incorporates forms of spf.and dkim. The latter uses a digital signature
while the former uses a DNS hack to verify that the server originating an email
address is actually authorized to send mail on behalf of that domain. The main
problem with both is that if not universally implemented for sending domains,
you either let through a lot of spam (if no spf, allow delivery) or you bounce
a lot of legitimate emails (if no spf, deny delivery) from false positives. A
hybrid rule if you elect for the restrictive policy is to allow delivery if an
spf policy is missing if the sending server has the same IP address as the mx
record in DNS for the sending domain, which really only works for relatively
small organizations.
Unfortunately, there is no real solution as Gary has noted. Yahoo would have
to publish a policy that says contesting.com servers are allowed to send emails
on behalf of yahoo.com. Ain't. Gonna. Happen. And this problem potentially
goes well beyond Yahoo. Any system implementing spf or dkim in a strict
implementation will exhibit the same behavior.
An alternative is for contesting.com to send out email as FROM:
xxxxx@contesting.com. The downside is that it becomes impossible to reply to
the originator, only the reflector. But yahoo.com emails would not bounce.
Al
AB2ZY
________________________________________
From: TowerTalk [towertalk-bounces@contesting.com] On Behalf Of GARY HUBER
[glhuber@msn.com]
Sent: Monday, April 14, 2014 3:19 PM
To: TT TowerTalk
Subject: [TowerTalk] Bounces
Here is what I received from a reflector administrator yesterday....
Yahoo introduced a feature (DMARC) this week that basically says "If a
message has a yahoo.com email address as the FROM address, and it didn't
come from a Yahoo.com server, then it's not acceptable."
This policy is not compatible with mailing lists. List messages all go out
with the email address of the person that posted the message. If the
person posting is using an @yahoo.com email address, the message goes out
with FROM: xxxx@yahoo.com. This message is sent from the mailing list
server and not from Yahoo.com's servers...
therefore Yahoo is not accepting these messages.
It's a little complicated, but this policy is also causing other members to
get unsubscribed due to bounces. Other providers are now bouncing these
messages, because Yahoo has basically instructed them to do so. You may
have already received some mail from our list, asking you to reconfirm your
subscription. It is because of this issue, caused by yahoo.com users
posting to our list.
You can read more about it here:
http://www.spamresource.com/2014/04/up-in-arms-about-yahoos-dmarc-policy.html
And here: http://www.ietf.org/mail-archive/web/ietf/current/msg87153.html
The second link suggests that to fix this problem we need to:
* Suspend posting permission of all yahoo.com addresses, to limit damage.
* Tell Yahoo users to get a new mail account somewhere else, pronto, if
they want to continue using mailing lists.
I am going to ask the Board to consider these options. This email is
mainly a heads up to yahoo.com email users that changes are a brewing and
you should be looking into other options for your mailing list mail.
One idea for yahoo.com users: Consider using a free email forwarder from
arrl.net and have it forward to your yahoo.com address.
Subscribe to the list with your arrl.net address, then
configure your email program to send from your arrl. email
address when you post to the (and other) mailing list. Another idea
would be to move to a different free email provider, such as GMail.
73 & DX,
Gary - AB9M
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