Your domain's email health, checked in seconds

Scan SPF, DKIM, DMARC, MX records, and blacklist status — with actionable fix instructions for every issue.

Email content linter

Paste your email HTML to check for spam triggers, missing unsubscribe links, and image-to-text ratio issues.

Lint email

Header analyzer

Paste raw email headers to see authentication results and mail routing path.

Analyze headers

What we check

Authentication check

Validates SPF, DKIM, and DMARC records to ensure your emails are properly authenticated.

Blacklist scan

Checks your domain's IP against 12 major DNS blacklists to detect reputation issues.

Stack detection

Automatically identifies your email providers — Google, Microsoft, SendGrid, and more.

Fix instructions

Get copy-paste DNS records and provider-specific guidance to resolve every issue.