Email Deliverability Optimization

Email deliverability is the practice of ensuring emails land in users' inboxes, not spam/promotions folders. It combines authentication protocols (SPF, DKIM, DMARC), infrastructure management (warm-up, IP reputation), content best practices, and list hygiene. Inboxes are gatekept by ISPs (Gmail, Outlook, Yahoo) using machine learning filters. Those filters evaluate sender reputation, authentication signals, content, and user engagement. Optimize all four, and you achieve 95%+ inbox placement. Ignore any one, and your emails get filtered.