Free email deliverability tools
Every tool reads public DNS and answers in plain English — free, no signup, unlimited. The same checks our monitoring runs, one domain at a time.
Am I good to send?
The full domain health check: SPF, DMARC, MX, DNS and 24+ blocklists in one go/no-go verdict — plus we auto-detect which sending tools are configured on your domain.
Checkers for the tool you send with
Each one verifies the exact DNS records your email tool requires, plus the foundation underneath.
Kit
Spam checker
Verified Sending Domain records, checked
Check your domain →beehiiv
Spam checker
Custom domain + the Cloudflare gotcha, checked
Check your domain →MailerLite
Spam checker
DKIM + the double-SPF mistake, checked
Check your domain →Mailchimp
Spam checker
k1/k2 authentication CNAMEs, checked
Check your domain →Constant Contact
Spam checker
Self-authentication records, checked
Check your domain →Klaviyo
Spam checker
Branded sending domain records, checked
Check your domain →Brevo
Spam checker
DKIM CNAMEs vs the code-only trap, checked
Check your domain →Missing your tool? The full health check works for every sender — and auto-detects what's configured on your domain.