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Why Is My Email Going to Spam? The 2026 Technical Guide to Fixing Email Deliverability

Email deliverability is crucial for ensuring that emails reach the inbox rather than the spam folder. Key factors affecting deliverability include using separate subdomains for different email types, proper email authentication (SPF, DKIM, DMARC), maintaining a good sender reputation, and ensuring high engagement rates. Additionally, employing double opt-in for subscriptions, using validated HTML structures, and avoiding shared tracking domains can significantly enhance deliverability. Tools like Google Postmaster and Mail-Tester can help monitor and improve email performance.