On 05/03/14 14:43, Mark Mielke wrote:
> According to these pages:
>
> http://yahoomail.tumblr.com/post/82426900353/yahoo-dmarc-policy-change-what-should-senders-do
>
> They say this:
>
> "*If you are a mailing list owner, what should you do?*
>
> Mailing lists are a special case of sending mail on behalf of
> individuals. The most common option is to use the mailing list’s address
> instead of the sender’s on the From: line. This will change the reply
> behavior.

This is a very poor hackaround and I am 100% against that. The message 
didn't come "From" the list (daemon), it came from a person. Every email 
software I've used in the past 25 years uses the From: header to 
generate the line you see at the top, reading

     On 05/03/14 14:43, Mark Mielke wrote:

I do not want to see that being changed into

     On 05/03/14 14:43, slony1-general at lists.slony.info wrote:

That would create a great deal of difficulty in figuring out from a 
later email in a longer thread with a lot of quoting, who actually wrote 
what.


 > Some mailing lists also choose to act as pure forwarders and
> resend the mail without breaking DKIM signatures. As of this
> publication, no common mailing list packages provide straightforward
> configuration options that produce DMARC compatibility, although Mailman
> has relevant features starting in 2.1.16. If you are a developer of
> mailing list software and would like help adding features to allow
> participants from domains with DMARC p=reject, please contact us at
> dmarc-help at yahoo-inc.com <mailto:dmarc-help at yahoo-inc.com>.
>
> More information about the DMARC specification and implementation advice
> is available at http://dmarc.org/"
>
>
> It seems like they believe Mailman has started to support the
> requirement capabilities in Mailman 2.1.16, and it is theoretically
> possible to support the required capabilities. I guess it's a bit
> premature for them to make the leap without being sure... but I do have
> sympathy for the idea that somebody has to be first, and nothing will
> kick the various mailing list software providers into adding support for
> DKIM signatures then breaking them for a major source of emails...
>
> I think my suggestion would be to make sure Slony is hosted by Mailman
> 2.1.16 or later, that some minimal effort is put into enabling the
> capability they describe ("Not breaking DKIM signatures...") and if it's
> not good enough, then so be it. Yahoo users can complain to their
> provider? At least you tried, so it's not your fault?

Note their wording, that 2.1.16 has "relevant features" but they don't 
know any package that actually works yet. I think my suggestion is to 
block Yahoo! senders and wait until there is an actual solution out 
there that is known to work.


Regards,
Jan

>
>
>
> On Wed, Apr 16, 2014 at 3:07 PM, Andrew Sullivan <ajs at crankycanuck.ca
> <mailto:ajs at crankycanuck.ca>> wrote:
>
>     On Wed, Apr 16, 2014 at 10:34:23AM -0400, Jan Wieck wrote:
>      > addresses possible again. I am in favor of following exactly the
>      > same route and block all mail from @yahoo.com <http://yahoo.com>
>     (and other DMARC
>      > participating ISPs) on our lists.
>
>     Just to be clear, it's not "DMARC participating", but a particular
>     profile of DMARC.  This particular DMARC setting is well-known to be
>     inappropriate for this kind of mail use.  That doesn't mean that all
>     uses of DMARC would have the same results.  Google, for instance, is a
>     big proponent and user of DMARC, and yet they have managed not to
>     break mailing lists.
>
>     A
>     --
>     Andrew Sullivan
>     ajs at crankycanuck.ca <mailto:ajs at crankycanuck.ca>
>     _______________________________________________
>     Slony1-general mailing list
>     Slony1-general at lists.slony.info <mailto:Slony1-general at lists.slony.info>
>     http://lists.slony.info/mailman/listinfo/slony1-general
>
>
>
>
> --
> Mark Mielke <mark.mielke at gmail.com <mailto:mark.mielke at gmail.com>>
>
>
>
> _______________________________________________
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> Slony1-general at lists.slony.info
> http://lists.slony.info/mailman/listinfo/slony1-general
>


-- 
Jan Wieck
Senior Software Engineer
http://slony.info