Yeah, Yahoo just basically broke the Internet,

        http://www.itworld.com/security/413581/yahoo-email-anti-spoofing-policy-breaks-mailing-lists

        http://www.ietf.org/mail-archive/web/ietf/current/msg87153.html

Hopefully, they'll figure out how foolish they are.

You may want to think about using, "p.p. mode" in Bridge - came out around v6.8. It was initially put in, so that you could run a mailing list with Amazon SES - you need to authenticate all mail senders w/SES, which is unrealistic for a discussion mailing list.

It may work in your case as well, since your member's yahoo addresses won't be in the From: header at all, so the DMARC stuff shouldn't be triggered.

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Justin J: Lead Dadaist.
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On Apr 8, 2014, at 8:07 PM, OCO Admin <oco_admin@PROTECTED> wrote:

>
> Hello,
>
> I am using Dadmail to run a small mailing list for a community
> orchestra. I am using the Bridge plugin so that all members can
> communicate quickly with the entire orchestra. This has been working
> well, but I recently ran into a problem that I am not sure how to solve.
>
> One of the subscribed members used his yahoo.com email address to send
> an email to the discussion list. The list had about 25 subscribers and
> the list admin (me) received bounce backs from all the subscribers with
> @gmail.com, @yahoo.com, @sympatico.com or @hotmail.com addresses. Each
> bounce back said the same thing: the email from the original sender
> @yahoo.com did not originate from yahoo and Yahoo has a DMARC policy to
> reject all emails that do not originate from yahoo.com domain.
>
> It took a few hours to figure out what was going on. My domain does have
> SPF and DKIM setup, but the problem is that the domain in the From:
> field was yahoo.com and not ottawachamberorchestra.com.
>
> So I started looking at options to rewrite the From: field. I am using
> Dadamail 6.5.2 and only the Announce-Only List Options would allow me to
> rewrite the From: header. Would it make sense to add this option to the
> Bridge Plugin? The header rewrite could look something like "original
> sender via domain" <list@domain> as suggested by
> http://dmarc.org/faq.html#s_22
>
> So does this make sense? Has anyone else had problems like this? Is
> there another solution that allows my subscribers to use their yahoo.com
> email addresses that I missed?
>
> Thank you
>
> Konrad
>
>
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