Free Microsoft DMARC Mandate Checker

Starting May 2025, Microsoft requires high-volume senders (5,000+ emails/day to Outlook.com, Hotmail.com, and Live.com) to publish a DMARC record with p=quarantine or p=reject. Unlike Google's mandate which accepts p=none, Microsoft requires active enforcement. Senders must also pass SPF and have aligned DKIM signatures.

The key difference is DMARC policy enforcement. Google accepts p=none (monitoring only), while Microsoft requires p=quarantine or p=reject (active enforcement). Both require SPF and DKIM authentication, but Microsoft's stricter policy requirement means domains must be further along in their DMARC deployment journey.

Microsoft routes non-compliant emails to the junk folder initially. Persistent non-compliance may result in outright rejection of messages. Microsoft also considers sender reputation, so repeated failures can permanently damage your domain's standing with Outlook's filtering systems.

The May 2025 enforcement primarily targets high-volume senders (5,000+ messages/day). However, Microsoft recommends all senders implement proper email authentication. Even low-volume senders benefit from DMARC, SPF, and DKIM, as these protocols improve deliverability and protect against spoofing.

Not necessarily. If your DMARC policy is p=none (the minimum for Google), you do not meet Microsoft's requirement of p=quarantine or p=reject. You need to upgrade your DMARC policy to at least quarantine. Vysiro's DMARC warm-up feature can help you safely transition from none to reject.

Use a phased approach: first monitor with p=none and rua reporting for 2-4 weeks to identify all legitimate senders. Then move to p=quarantine with pct=10, gradually increasing to pct=100. Finally, switch to p=reject. Vysiro automates this warm-up process on paid plans with real-time monitoring.