Email Deliverability Best Practices for 2026

Why Deliverability Matters

You can craft the perfect email, but if it lands in spam, nobody sees it. Email deliverability — the percentage of emails that reach the inbox — is the foundation of every email marketing program.

Authentication Setup

Implement SPF, DKIM, and DMARC authentication for your sending domain. These protocols prove to email providers that you are who you claim to be. Without them, your emails are far more likely to be filtered as spam. Check your setup with our email deliverability checker.

List Hygiene

Remove bounced addresses immediately, suppress unengaged subscribers after 90 days of inactivity, and never buy email lists. A clean list with 5,000 engaged subscribers will outperform a dirty list of 50,000 every time.

Content Optimization

Avoid spam trigger words, maintain a healthy text-to-image ratio, and always include a clear unsubscribe link. Test your subject lines with our email subject line tester before sending to your full list.

Warm-Up Strategy

If you are using a new sending domain or IP, gradually increase volume over 2-4 weeks. Use our email warm-up planner to create a structured ramp-up schedule.