Mailing List Mail From @yahoo Addresses

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[extracted from “Re: [CentOS] dnf and failing epel” message chain.]

I believe that the issue is that yahoo updated their dmarc record a bit ago, so now won’t accept mail, from 3rd-parties, that has an
@yahoo… “mailfrom”, as yours do on this list.

If the non-@yahoo mailing sender doesn’t do what’s necessary to deal with enforced dmarc, and your mail provider enforces dmarc, you won’t see messages from @yahoo correspondents — which is likely why you aren’t seeing your own list messages. Additionally if a mailing list has enough @yahoo posters, this can generate sufficient bounces to get you kicked off the mailing list on a regular basis.

There are various ways for mailers/mailing lists to deal with the enforced dmarc. My understanding is that with Mailman, which this list uses, one has to upgrade to -3.

Email service providers can’t send to/from Yahoo Mail addresses

Questions about our DMARC policy
Why are my emails bouncing?

We’ve updated the DMARC record with “p=reject” for multiple
Yahoo domains.

This means all DMARC compliant mail receivers (including Yahoo,
Hotmail, and Gmail) are now bouncing emails sent as “@yahoo.com”
addresses that aren’t sent through Yahoo servers. Any messages
without a proper Domain Keys Identified Mail (DKIM) signature or
Sender Policy Framework (SPF) alignment will be rejected.

9 thoughts on - Mailing List Mail From @yahoo Addresses

  • well, I’m not sure if I feel better now, I understand there must a plethora of people who fidgeted like me trying to understand what happened (some time ago) – I see I’m not alone, but… it seems larger issue. Would be great if list maintainer(s) look into this and even greater if can fix it. many! thanks Richard

  • we can’t fix yahoo, they broke this. the only “solution” is to hack the
    ‘from’ of emails sent to the list so they are ‘from’ the list server rather than ‘from’ the person who sent the message. I’ve seen a few lists that do this, its awful seeing every message be ‘From: ‘

  • For what it’s worth, I just received the auto-notification of having been kicked off the list for excessive bounces. So gmail is honoring Yahoo’s DMARC.

  • –9tHPEoUOudGO78adQajDCOVlHDihUVPtk Content-Type: text/plain; charset=windows-1252
    Content-Transfer-Encoding: quoted-printable

    Me too. Must we do something about?

  • In one of the Yahoo articles I referred to earlier they indicate that Hotmail and Gmail (in addition to themselves) enforce DMARC. My mail provider (Rackspace) does now too so I get dropped off various lists
    (including this one the other day) every few days.

    The issue is in how the mailing list sends out messages. If they are addressed as if they come from an @yahoo address (e.g,. the original poster), but not from an authorized yahoo mail server, any mail server enforcing (in this case yahoo’s) DMARC will reject the message. After enough bounces the mailing list will drop you (with or without notice). Short of getting your mailing list mail via a provider that doesn’t enforce DMARC this week, there’s nothing an end-user can really do.

    mailman 2.1.18 can (or can be made to) deal with the addressing so that things pass the DMARC test. This list appears to use 2.1.12.

  • If your mail provider enforces DMARC, whether you get dropped from a list and how often depends on the frequency of messages sent to the list from @yahoo correspondents and the list’s “drop on bounces” (how often over what time period) settings. This list doesn’t appear to have that many people who post from @yahoo addresses, and the “drop”
    settings seem to be fairly tolerant.