Email Deliverability Issues in 2026: 9 Common Problems and Fixes
Security Boulevard, Wednesday, June 17th, 2026
Nine common 2026 email deliverability problems, from missing SPF/DKIM/DMARC to poor list hygiene, and their fixes.
The article outlines nine common email deliverability problems and how to fix them in 2026. Issues include missing SPF, DKIM, and DMARC records, outdated email lists, and inconsistent sending activity, all of which hurt inbox placement.
Major providers like Gmail, Yahoo, and Microsoft now evaluate senders more holistically, weighing user experience, consent, list hygiene, and overall sending patterns.
Shared IP reputation is a risk: another sender's spam or malicious activity on the same IP can damage your deliverability even with clean practices. Recommended fixes include warming up new IPs slowly and gradually increasing volume as engagement stays healthy.