BizMailNetStart diagnosis

Live DNS diagnostics

Check your business email domain

Inspect what your domain publishes in DNS. We'll explain what it shows, what needs review, and what this cannot prove about actual messages.

Run a domain inspection

Enter a domain only. No account or email address is required.

Basic DNS inspection sends only the domain. Optional advanced SPF sends your supplied MAIL FROM domain and IP when requested.
Your answer changes how the records are explained. It stays in this browser and is not sent to the DNS service. Include website forms, automated messages and third-party services when deciding.
Advanced checks require the Cloudflare Worker. Basic DNS checks still work without them. An IP-based SPF result only applies to the identity and IP you supply.