Microsoft/Outlook.com is quietly beginning to reject emails from domains that do not have a valid DMARC record configured. This move aligns with Microsoft's ongoing push to enforce email authentication standards and reduce spam/phishing, but will impact deliverability for organizations and individuals without proper DNS records in place.
Background
DMARC (Domain-based Message Authentication, Reporting & Conformance) is an email authentication protocol that helps protect domains from unauthorized use. Major providers like Google, Yahoo, and Microsoft have been progressively enforcing stricter DMARC policies since 2024-2025.
- Source
- Hacker News (RSS)
- Published
- Nov 9, 2026 at 03:20 AM
- Score
- 7.0 / 10