SPF, DKIM, and DMARC: Why You Can Set Up All Three and Still Get Rejected
Since February 2024, Gmail and Yahoo have required every sender pushing 5,000 or more messages a day to authenticate with SPF, DKIM, and DMARC. In November 2025, Gmail moved from soft delays to permanent rejections for senders that keep failing. The trap most marketers miss: you can publish all