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

Joe Sniderman joseph.sniderman at thoroquel.org
Mon Apr 14 20:33:43 CEST 2014

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.

Joe Sniderman <joseph.sniderman at thoroquel.org>

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