However, if enhanced filtering for connectors is enabled, we do apply “Honor DMARC” even when MX is pointed to 3rd party, and it will be treated as normal incoming message. Note that if the tenant recipient domain's MX record points to a different email security solution that sits in front of Office 365, then 'Honor DMARC' will not be applied because the information about the sending infrastructure is likely affected by the complex mail flow routing. However, you can change this behavior and specify different actions for different policies in the Anti-Phishing policy section of the Microsoft 365 Defender portal.

If the recipient domain's MX record points to Office 365, by default, we will honor the sender’s DMARC policy and reject (p=reject) or quarantine (p=quarantine) the email as instructed. If an email fails DMARC validation and the sender’s policy is set to p=reject or p=quarantine, we will reject the email.įor our enterprise customers, you can now 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. Today, we are announcing important changes to our DMARC policy handling that affect both consumer and enterprise customers.įor our consumer service ( / / ), we have changed our DMARC policy handling to honor the sender’s DMARC policy. This helps the sender protect their reputation and brand from being spoofed and helps the recipient avoid emails from unverified senders. There are three possible values for the policy: none, quarantine, and reject. It tells the receiver what to do if an email fails DMARC validation. The ‘p=’ value (this stands for “policy”) in a DMARC TXT DNS record represents the sender’s policy for their domain. 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. Domain-based Message Authentication, Reporting & Conformance (DMARC) is a standard that helps prevent spoofing by verifying the sender’s identity.

Outlook office 365 sign in