Why Gmail Sends Emails to Spam and How to Fix the Problem
Tech News, Tuesday, May 26th, 2026
Gmail filters emails based on sender trust through authentication, content patterns, and recipient engagement signals.
Gmail uses a trust-based scoring system to determine whether emails reach the inbox or spam folder, evaluating three key factors: technical authentication (SPF, DKIM, DMARC protocols), sending behavior patterns, and recipient engagement signals.
Missing or misconfigured authentication is the leading technical cause of legitimate emails being filtered as spam, and fixing these protocols typically produces quick improvements.
Long-term inbox placement depends on maintaining consistent sending behavior, keeping clean email lists, and generating positive recipient engagement, which Gmail monitors continuously across every sending domain.