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Email deliverability is the ability of your emails to reach recipients' inboxes — rather than the spam folder, or being silently rejected. It depends on dozens of technical and behavioral factors that mailbox providers evaluate for every message.
Unlike email delivery (which simply means the message was accepted by a receiving server), deliverability measures whether the message actually ends up where the recipient will see it. You can have 100% delivery and 40% inbox placement.
The main factors affecting deliverability are: DNS authentication (SPF, DKIM, DMARC), sending IP and domain reputation, blocklist presence, content quality, and engagement signals from past recipients.
Verify that your authentication and IP reputation are healthy before sending to thousands of recipients. A single configuration change can break deliverability.
A sudden drop in open rates often means Gmail or Outlook started routing your emails to spam. A deliverability test pinpoints the cause.
Changed your ESP, MTA server, or DNS records? Test immediately to confirm everything is configured correctly and your authentication passes.
DNS records can change unexpectedly, IPs get listed on blocklists without warning. Regular testing catches issues before they impact your campaigns.
Your deliverability score (0–100) aggregates results from 40+ checks across 5 categories.
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