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DMARCIAN: Reject inbound emails failing DMARC with Microsoft 365
- October 28, 2022
- Posted by: Top Deliverability
- Category: DMARC DMARCIAN Email Authentication Email Services Industry News
DMARCIAN just published a new interesting post:
By default, Microsoft 365 handles inbound emails failing DMARC for domains with a DMARC policy of reject the same way as if they had a policy of quarantine. Read more here about how Microsoft 365 handles inbound email that fails DMARC. Administrators can specify an action to be taken on emails classified as “spoof” through configuring an anti-phishing policy; however, none of these actions include rejecting the email with an error code. After all, a domain owner who has gone through the process of deploying a DMARC policy of reject would want to be alerted of emails being rejected. You may also wish to reject emails failing DMARC where your own domain is being spoofed. This can be achieved through the use of an Exchange mail flow rule. An email that failed DMARC where the domain has a reject policy published will be marked in the Authentication-Results headers by Microsoft
Read more here: Reject inbound emails failing DMARC with Microsoft 365
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