Per-Provider Playbooks: Operating Gmail, Microsoft, and Yahoo Differently
The big three score senders differently, expose different data, and fail in different ways. One operating playbook per provider beats one averaged strategy.
#Microsoft
5 articles with this tag
Microsoft's Rejection Phase Is Live: A 550 5.7.515 Field Guide
Outlook now hard-rejects non-compliant bulk mail with 550 5.7.515, and Safe Senders cannot override it. Diagnosing the bounce and fixing the authentication behind it.
2025 in Email: The Year Authentication Became Mandatory Everywhere
Microsoft joined the mandate, Gmail moved to hard rejection, and DMARCbis reached the finish line. What 2025 changed for senders and what it sets up for 2026.
Microsoft's New Outlook Sender Requirements: A Compliance Guide
Microsoft now requires SPF, DKIM, and DMARC from high-volume senders to Outlook consumer domains. What the rules demand, how enforcement works, and how to comply.
Postmaster Tools vs. SNDS: Reading Gmail and Microsoft Reputation Data
Gmail Postmaster Tools and Microsoft SNDS report sender reputation in fundamentally different ways. How to read both dashboards and act on what they actually show.