Had an issue that started last week around 0304 CST 11/7/2024, mail deliverability for our Exchange service went to zero. Looking closer it appears that the DNSSEC chain is failing, because an invalid RCODE is being returned. Forcing +noedns on our recursive boxes is our current workaround, but would prefer not to leave this in place. Perhaps go chat up your favorite DNS team member?
https://dnsviz.net/d/mail.protection.outlook.com/dnssec/ Hit me up if you want the case number or other details. Thanks for your time, Chad D
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