Site & email diagnostics
Inspect SPF/DKIM/DMARC/MX and IP information to investigate mail or connection problems. Pick what to check.
Instructions, guides and related tools
Result
Choose a check below, or enter a domain to start with email deliverability.
Next checks and services
Planning a website or business email setup? Review Value Domain One’s services and their terms.
What this check does
Choose a tool for DNS records, email authentication or your current connection. Each page shows its current availability. DNS observations do not establish mail delivery, and a timeout alone does not establish an outage.
How to read the result
Each check is green (OK), amber (review), or red (missing/issue). Red and amber include how to fix it.
Glossary
- SPF
- A DNS record that declares which servers may send mail for the domain.
- DMARC
- A policy for how to handle mail that fails SPF/DKIM.
FAQ
- Do I need an account?
- No. Every check works without sign-up or login.
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