Free tool
Will your mail land inthe inbox, or the spam folder?
Enter any domain. We read its SPF and DMARC records, explain what receivers see, and tell you what to fix. No account, no API key, nothing stored.
What this checks
SPF and DMARC, explained term by term.
SPF declares which servers may send mail for a domain. DMARC tells receivers what to do when authentication fails. Both are TXT records in DNS, and most are misconfigured. We read them, parse every term, count the lookup budget, and list every finding with its consequence.
- SPF recordParsed term by term: mechanisms, qualifiers, include chains and the ten-lookup limit.
- DMARC recordPolicy, subdomain policy, percentage, aggregate report address, and alignment.
- MX recordsThe mail servers the domain points to, in priority order.
- Every finding explainedNot a score. Each finding names the problem and its consequence, because different problems call for different fixes.
API
The same analysis, as an endpoint.
Everything this page shows is available as a JSON endpoint
at POST /v1/sender. One call, one domain,
structured findings you can act on in code.