In the world of email marketing, nothing is more frustrating than crafting the perfect campaign only to have it vanish into the spam folder. As we approach 2026, spam filters have become smarter and stricter than ever. Major providers like Gmail, Yahoo, and Microsoft have tightened their rules, with full enforcement of authentication protocols and low tolerance for poor sender practices. In 2025 alone, global inbox placement rates hovered around 84-85%, meaning roughly one in…