SPF Record Checker
Inspect and validate your domain's Sender Policy Framework (SPF) record, count DNS lookups to avoid the 10-query limit, and identify syntax errors.
What is SPF and what is the 10-lookup limit?
Sender Policy Framework (SPF) is an email authentication technique used to specify which IP addresses and email services are authorized to send mail on behalf of your domain name.
Strict 10-Lookup Limit
RFC 7208 limits SPF evaluation to a maximum of 10 DNS queries across all 'include', 'a', 'mx', 'ptr', and 'redirect' mechanisms. Going over 10 results in PermError, leading recipient spam filters to drop your mail.
Only One Record Allowed
Publishing two or more 'v=spf1' TXT records automatically invalidates all of them. Always merge your sending services (e.g. Mailofly, Google Workspace, Zendesk) into one single record.
~all vs -all Qualifiers
Softfail (~all) is the recommended modern standard when combined with DMARC, allowing mail to be delivered while sending authentication signals to spam filters.
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