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

Jim Popovitch jimpop at gmail.com
Wed Apr 16 03:58:13 CEST 2014

On Tue, Apr 15, 2014 at 9:50 PM, Conrad G T Yoder <conrad at yoders.org> wrote:
> On Apr 15, 2014, at 2:11 PM, Jim Popovitch <jimpop at gmail.com> wrote:
>> On Tue, Apr 15, 2014 at 2:05 PM, Lindsay Haisley <fmouse at fmp.com> wrote:
>>> On Tue, 2014-04-15 at 12:38 -0400, Jim Popovitch wrote:
>>>> Just to be clear, all those domains (other than yahoo.com) will bounce
>>>> email to you if your list sends out an email from a yahoo.com
>>>> subscriber.  It's not the case that you need to prevent all those
>>>> other domains (AOL/MSN/etc) from posting, just don't allow yahoo.com
>>>> addresses to post to the list.
>>> So just to be clear, putting a damper on this at this point requires
>>> _only_ that posts from yahoo.com be blocked from posting to a list.  Is
>>> this correct?  This can be done by selectively unsubscribing (or
>>> moderating) current yahoo.com users and adding "^.*@yahoo\.com" to the
>>> ban_list of addresses banned from membership going forward.  Should some
>>> other ESP start publishing advisory DMARC records then said ESP would
>>> need to be added to the ban_list as well.
>>> Am I correct in this?
>> You don't need to ban yahoo members, you just most likely don't want
>> them posting.
>> As of right now, today, you should prevent yahoo.com addrs from
>> posting to your lists.  Of course that could all change tomorrow if
>> Hotmail published a dmarc p=reject record.  However, given the yahoo
>> fallout, I think it will be a while before we see anymore of this
>> kinds of shenanigans.  I'm still predicting that yahoo pulls their
>> dmarc record (unless of course they are getting out of the end-user
>> email biz)
> So it really doesn’t affect domain email hosted by Yahoo such as att.net, sbcglobal.net, ymail.com, etc?  Yahoo has not added a dmarc p=reject record for email from these domains?

Correct.  But that could all change tomorrow if they do add dmarc
records for those domains.

-Jim P.

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