If you caught our recent post, What Microsoft’s New DMARC Policy Means for High-Volume Senders, you’re already familiar with the major changes Microsoft has made to tighten DMARC enforcement as of May 5, 2025. As a reminder, any mass sender (sending over 5,000 emails per day) without proper DMARC alignment will be outright rejected by outlook from now on.
First seen on securityboulevard.com
Jump to article: securityboulevard.com/2025/05/dmarcs-future-ignoring-email-authentication-is-no-longer-an-option/
