Email Deliverability: How to Keep Your Emails Out of Spam

Email deliverability is the percentage of your emails that actually reach the inbox rather than spam folders or being blocked entirely. Even well-crafted campaigns fail if they land in spam.

Authentication is the foundation. SPF, DKIM, and DMARC records verify that emails are genuinely from your domain. Without these DNS records configured correctly, email providers are more likely to flag your messages as suspicious.

List hygiene directly impacts deliverability. Remove bounced addresses immediately. Purge subscribers who have not opened an email in 6-12 months. Sending to unengaged addresses signals to email providers that your content is unwanted.

Sending reputation builds over time. If you are sending from a new domain or IP, warm it up gradually. Start by sending to your most engaged subscribers and slowly increase volume over 2-4 weeks. Sudden large sends from new infrastructure trigger spam filters.

Content matters for deliverability, not just engagement. Avoid spam trigger words in subject lines (free, guaranteed, act now). Maintain a reasonable text-to-image ratio. Include a plain text version alongside HTML. Always include an unsubscribe link.

Monitor your sender reputation using tools that track blacklist status, spam complaint rates, and bounce rates. A spike in any of these metrics indicates a deliverability problem that needs immediate attention.