In this article, we explore why Google, Yahoo, and Apple have set deadlines for new DMARC policies (Domain-based Message Authentication, Reporting & Conformance), what these entail, and their implications for businesses sending bulk emails. Starting February 2024, Gmail and Yahoo will mandate strong email authentication to combat phishing and reduce inbox clutter. Google will require DMARC policies, SPF (Sender Policy Framework), and DKIM (DomainKeys Identified Mail) alignment for senders dispatching over 5,000 emails daily.