Microsoft Joins Google and Yahoo in Strengthening Email Sender Requirements - Cybersecurity Insiders

Microsoft, Google, and Yahoo are implementing stricter email sender requirements to enhance security and user trust. These requirements, effective May 2025 for Microsoft and earlier for Google and Yahoo, include SPF, DKIM, and DMARC authentication, as well as best practices like valid “From” addresses and one-click unsubscribe options. Organizations must prioritize email authentication and transparent opt-out mechanisms to ensure high deliverability and protect their brand reputation.