On 30 December 2025 11:13:08 Slavko via mailop <[email protected]> wrote:
AFAIK, DMARC is based on SPF or DKIM, thus missing DKIM is OK if SPF is OK (message is not forwarded) ;-)
I believe that Microsoft now requires BOTH SPF and DKIM (and DMARC) for messages from "large senders" (which Mailop may be on a busy day)
https://techcommunity.microsoft.com/blog/microsoftdefenderforoffice365blog/strengthening-email-ecosystem-outlook%E2%80%99s-new-requirements-for-high%E2%80%90volume-senders/4399730 Paul
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