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

[Larry Stone]

On Apr 14, 2014, at 5:51 PM, Jim Popovitch <jimpop at gmail.com> wrote:

> On Mon, Apr 14, 2014 at 3:16 PM, Lindsay Haisley <fmouse at fmp.com> wrote:
>> So what is being said here?
> 
> When a yahoo poster sends an email to your list, that email is
> reflected to the rest of the other subscribers.  Those other
> subscribers may or may not check yahoo's dmarc policy before accepting
> your list email.  If they do reject your list message, then that
> equals 1 mailman bounce.  After a few posts from yahoo members, the
> bounce scores increase and the other subscribers are unsubscribed.

I think most of us are clear on that point. Where I’m confused (and I’m thinking that’s what Lindsay is asking about) is where you said

> Yes!  (maybe start reading threads from the bottom up?)   :-)

in response to

> On Mon, Apr 14, 2014 at 2:33 PM, Joe Sniderman
> <joseph.sniderman at thoroquel.org> wrote:
>> On 04/13/2014 06:03 PM, Jim Popovitch wrote:
>>> On Sun, Apr 13, 2014 at 4:54 PM, Joseph Brennan
>>> <brennan at columbia.edu> wrote:
>>>> 
>>>> Jim Popovitch <jimpop at gmail.com> wrote:
>>>> 
>>>>> DMARC works off of SPF as well.
>>>> 
>>>> 
>>>> Not really.
>>> 
>>> DMARC checks alignment of *both* DKIM and SPF, if either is broken
>>> DMARC fails.
>> 
>> Nooooooo...    If either one passes, DMARC passes.
>> 
>>>> SPF does not check the "From:" header line, and that's where the
>>>> troubles begin with DMARC.
>>> 
>>> SPF checks sending IPs (of which your IPs won't match Yahoo's, thus
>>> breaking DMARC)
>>> 
>>> Either an SPF failure or a DKIM failure will cause a DMARC rejection
>>> if p=reject.
>> 
>> Even if that were the case, which it is not, SPF should pass - since
>> typically the list is the envelope sender.

To what are you saying “Yes”? With what are you agreeing?

—
Larry Stone
lstone19 at stonejongleux.com
http://www.stonejongleux.com/