Delivery Rate

Understanding Delivery Rate

Delivery rate tells you whether your emails are reaching mail servers, but it does not tell you whether they land in the inbox or the spam folder. A 98% delivery rate means 2% of your emails bounced entirely — they never reached the recipient's server at all. Of the 98% that were delivered, some may have been routed to spam or promotional tabs rather than the primary inbox.

Factors that affect delivery rate include list hygiene (invalid or abandoned email addresses cause hard bounces), sending infrastructure (shared vs dedicated IP addresses, authentication protocols like SPF, DKIM, and DMARC), sending volume and consistency (sudden spikes trigger spam filters), and engagement metrics (if many recipients ignore or mark your emails as spam, mail servers start rejecting them).

For Shopify merchants using platforms like Klaviyo, Mailchimp, or Omnisend, most technical infrastructure is handled by the platform. Your primary responsibility is maintaining list quality — removing invalid addresses, honoring unsubscribes promptly, and avoiding purchasing email lists. Purchased lists are the fastest way to destroy your sender reputation and tank delivery rates.

Monitoring delivery rate should be part of your regular email marketing review. A sudden drop in delivery rate often indicates a technical issue (authentication misconfiguration), a list quality problem (large batch of invalid addresses from an import), or a reputation issue (too many spam complaints). Address drops immediately before they compound.