On Tue, Jun 10, 2025 at 9:46 PM Marcel Becker via mailop <mailop@mailop.org> wrote:
> > Disappeared means they had records before? I am not sure about that. > Hmm, you're right. Based on the bounces from Microsoft, I had ass-umed there had been a DMARC record before. Checking our logs, it's clear there wasn't, and I was wrong. Doing some more research (which I should have done in the first place...), we may be getting bit by this change, although it talks about it taking effect May 5th: https://techcommunity.microsoft.com/blog/microsoftdefenderforoffice365blog/strengthening-email-ecosystem-outlook%E2%80%99s-new-requirements-for-high%E2%80%90volume-senders/4399730 Mark
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