Wow, there’s just been an outburst of shouting in the IETF (Internet
Engineering Task Force, the geeks who keep this whole thang running)
about this, so it’s not just you, and I imagine there are some people
having a well-deserved Really Bad Day over at Yahoo just now.

On Mon, Apr 7, 2014 at 2:30 PM, Matthew Hunt <[email protected]> wrote:
> This problem is affecting most of my mailing lists, and it appears to
> be due to a deliberate change by Yahoo:
>
> https://wordtothewise.com/2014/04/brief-dmarc-primer/
> https://wordtothewise.com/2014/04/example-bounces-due-yahoo-preject/
>
> "Endusers can do a couple things . For one-to-one mail make sure
> you're using the Yahoo outgoing mail servers and that should fix the
> problem without you having to really make any change. For email to
> mailing lists you'll need to switch to an email address at another
> domain for that mailing list."
>
> As I understand it: Yahoo is telling recipient email services not to
> accept mail from Yahoo email addresses that doesn't come from Yahoo's
> servers. Since email on this mailing list, or other mailing lists,
> comes from non-Yahoo servers, Gmail and other recipients reject the
> mail, or mark it as spam, in accordance with Yahoo's request.
>
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