✅ SPF Record Validator
Analyze an existing SPF record for errors, warnings, and best practice violations.
SPF Lookup Limits
SPF has a limit of 10 DNS lookups to prevent denial-of-service attacks. Each include:, a, mx, ptr, exists, and redirect mechanism counts as one lookup. Nested includes count towards the total.
If you exceed 10 lookups, your SPF record will fail validation and emails may not be delivered.