Email Deliverability Audit: A Step-by-Step Guide

An email deliverability audit evaluates the technical, reputational, content, list-quality, and engagement factors that determine whether messages reach recipients’ primary inboxes rather than being bounced, blocked, or filtered as spam. Regular audits are recommended quarterly for frequent senders, after large campaigns or infrastructure changes, and whenever performance metrics such as bounce rates, opens, or spam complaints decline. The process includes tracking delivery and engagement metrics; reviewing SMTP configuration, encryption, domains, IP setup, and dedicated sending streams; verifying SPF, DKIM, and DMARC authentication; monitoring domain and IP reputation and blacklists; and assessing content for misleading subject lines, spam-triggering language, unsafe links, poor text-to-image balance, and inadequate mobile optimization. It also emphasizes validating and segmenting mailing lists, removing invalid or risky addresses, monitoring opens, clicks, unsubscribes, and complaints, and targeting campaigns based on subscriber engagement. Ongoing improvements include selecting a reliable and scalable email service provider, gradually warming up new domains or infrastructure, using permission-based subscription practices, providing clear unsubscribe options, protecting subscriber data, and complying with regulations and mailbox-provider requirements.

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