What this checker tests
- Published SPF TXT record
- Mechanisms, modifiers, and qualifiers
- Duplicate records and syntax
- Estimated DNS-lookup count and permissive policies
Free domain diagnostic
SPF Checker
Check a domain's SPF record, validate common problems, and understand what the policy means.
How to understand the result
SPF lists the services allowed to send email for a domain.
A soft fail (~all) marks other senders as suspicious; a hard fail (-all) asks receivers to reject them.
Unusual does not always mean broken—confirm every legitimate sender before changing a policy.
Common problems
- More than one SPF record
- More than ten DNS-triggering mechanisms
- A dangerously permissive +all policy
- Missing includes for legitimate sending services