Email remains the primary entry point for phishing, fraud, malware, and Business Email Compromise (BEC) attacks. While Microsoft 365 provides a strong foundation, organizations need additional layers of protection to defend against increasingly sophisticated threats

The email landscape has fundamentally changed — and in 2026, there is no ambiguity left:

DMARC is no longer optional. It is enforced.

Over the past two years, the world’s largest mailbox providers — Google, Yahoo, and Microsoft — have implemented strict authentication requirements. Today, any domain sending bulk email must have properly configured SPF, DKIM, and DMARC, or risk outright rejection. [mailcop.net], [redsift.com]

This shift marks the end of the “open email era” and the beginning of a trust-based ecosystem where authentication is mandatory.