Email deliverability checker
Deliverability is the sum of many settings: authentication, DNS health, reputation, and mail server configuration. Enter a domain for a single graded report that checks each of them and explains what to fix first.
Runs the full report, including this check.
What the audit covers
- Authentication: SPF, DKIM, and DMARC, plus how well they align.
- Routing: MX records and the detected mail provider.
- DNS integrity: DNS health and DNSSEC.
- Reputation: blacklist listings for the domain and its mail server IPs.
- Transport: a live SMTP probe of the mail servers.
How to read the grade
The report gives an A to F grade and a 0 to 100 score. Failing and warning checks are weighted by severity, and critical gaps cap the grade so a domain cannot score well while trivially spoofable. Fix the failing checks first, then the warnings.
For teams and pipelines
Run the same audit from scripts through the JSON API or from an AI agent over the MCP server, for example as a pre-send gate before a large campaign.
Frequently asked questions
What hurts email deliverability the most?
Missing or weak authentication (no DMARC, a permissive SPF all-qualifier, no DKIM) and blacklist listings do the most damage. Broken MX records stop inbound mail entirely. This audit flags each of these.
Can a high grade guarantee inbox placement?
No. A strong grade removes the technical reasons mail gets filtered, but placement also depends on sending reputation, content, and recipient engagement, which no static check can measure.