New DMARC Policy Handling Defaults for Enhanced Email Security
New DMARC Policy Handling Defaults for Enhanced Email Security
Domain-based Message Authentication, Reporting & Conformance (DMARC) is a standard that helps prevent spoofing by verifying the sender’s identity. If an email fails DMARC validation, it often means that the sender is not who they claim to be, and the email could be fraudulent.
The ‘p=’ value (this stands for “policy”) in a DMARC TXT DNS record represents the sender’s policy for their domain. It tells the receiver what to do if an email fails DMARC validation. There are three possible values for the policy: none, quarantine, and reject. This helps the sender protect their reputation and brand from being spoofed and helps the recipient avoid emails from unverified senders.
Microsoft announce important changes to DMARC policy handling that affect both consumer and enterprise customers. For consumer service (live.com / outlook.com / hotmail.com). If an email fails DMARC validation and the sender’s policy is set to p=reject or p=quarantine, it will reject the email.
For their enterprise customers, they can choose how to handle emails that fail DMARC validation and choose different actions based on the policy set by the domain owner, such as p=reject or p=quarantine. By default, we will honor the sender’s DMARC policy and reject or quarantine the email as instructed. However, customer can change this behavior and specify different actions for different policies in the?Anti-Phishing policy?section of the Microsoft 365 Defender portal.
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