[Cialug] Yahoo & list email

[Andrew Denner]

Not having the full headers for the email it is hard to tell exactly what
is going on. One possible hint is that if it is from a yahoo sender, their
documentation linked to in that rejection notice says:

> Our DMARC policy proactively protects our users from email spam that
> mimics Yahoo users’ email addresses from other mail servers. This helps
> secure our users’ email identities from being used by unauthorized senders.
> It also interferes with some long-standing uses of identities that are
> authorized by the user but not verifiable.
> By publishing a “p=reject” record, Yahoo tells other DMARC compliant
> systems to reject mail from Yahoo users that isn’t genuinely originated
> from a Yahoo server. This affects only mail with Yahoo addresses on the
> From: line.
> [image: screenshot of an example with From line with a yahoo.com domain
> from a Yahoo server]

In the case of our listserve, you can see that in the eyes of the
receiving mail server cialug's mailing list is sending an SPF record that
it was sent from cialug-bounces at cialug.org from a permitted IP address.

Received-SPF: pass (google.com: domain of cialug-bounces at cialug.org
> designates 107.170.101.237 as permitted sender) client-ip=107.170.101.237;


tl;dr Email is hard, Yahoo's email even more so. There is a reason most
places pay Google, Microsoft et.al. to make the problem go away.

On Fri, Sep 15, 2017 at 12:09 PM, L. V. Lammert <lvl at omnitec.net> wrote:

> On Fri, 15 Sep 2017, Andrew Denner wrote:
>
> > Based on the error message, either your email was missing the
> > requiredDKIM, SPF, or DMARC record. The first thing that I would do is
> > look at theheaders of the failed email and see if there is more
> > information of a rejected record or something else like that.
> >
> If it were such an issue, why does email to the list from a non-yahoo user
> pass without issue TO yahoo users?
>
> The list domain does not have an email server, it's MX records point to
> our corporate system which is fine with SPF.
>
>         TFTR!
>
>         Lee
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