Add a DMARC record to my domain for Microsoft 365

Quoted on this wiki

Every place a page here uses this source, in the order the words come in it.

1. Define how suspicious email is handled by DMARC “The value of the DMARC TXT record includes a “p=” parameter.” p=none: The receiving email server performs no action against unauthenticated email but instead sends a report to an email listed in the mailto: address on the DMARC record.

   In DMARC policies

2. Define how suspicious email is handled by DMARC “The p stands for “policy.”” p=none: The receiving email server performs no action against unauthenticated email but instead sends a report to an email listed in the mailto: address on the DMARC record.

   In DMARC policies

3. The value of the DMARC TXT record includes a “p=” parameter. The p stands for “policy.” When an email appears to be from your domain but doesn’t contain the correct information, you can use 1 of 3 policies to define how that email gets handled: “p=none: The receiving email server performs no action against unauthenticated email but instead sends a report to an email listed in the mailto: address on the DMARC record.” p=reject: The receiving email server denies and blocks unauthenticated email.

   In DMARC policies

4. p=none: The receiving email server performs no action against unauthenticated email but instead sends a report to an email listed in the mailto: address on the DMARC record. “p=reject: The receiving email server denies and blocks unauthenticated email.” (Recommended) p=quarantine: The receiving email server quarantines unauthenticated email (for example, sending them to a junk or spam folder instead of an inbox). This is the policy we use in the steps below.

   In DMARC policies