Blog Post
Strengthening Email Ecosystem: Outlook’s New Requirements for High‐Volume Senders
Sounds good. Is there a plan to implement this to business domains that utilize Exchange Online as well?
Also, what was the reasoning behind going with p=none as the requirement vs. p=reject or p=quarantine? Is this going to eventually change to p=reject?
- PuneethApr 04, 2025
Microsoft
We don't plan to expand this to Enterprise yet. Enterprise environments have complex mail flows that can break DMARC. We’ll get there eventually, but not with this release. This is focused only on Microsoft's consumer services.
For DMARC, a minimum of p=none is required. Over time, we aim to move toward stricter authentication without causing major email disruptions.
- jcowartJun 24, 2025Copper Contributor
What you've missed is that those "complex mail flows" exist on the sending side as well, making compliance with these guidelines challenging in the absurdly short timeframe you gave the community and even undesirable.