On Thu, Feb 1, 2024 at 10:12 AM Todd Herr via mailop <[email protected]> wrote:
> > I've seen as yet unconfirmed speculation that this might be the error > response Yahoo is using for those that don't comply with the new (as of > today) requirements that mail be authenticated using SPF, DKIM, and DMARC. > > See also - https://senders.yahooinc.com/best-practices/ > > We've seen this specific error message before. It doesn't appear related to specific email addresses. It may be tied to specific characteristics of a given email, but I haven't researched it enough to say for certain. We see that message sporadically. Cheers, Mark
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