SPF Record Checker
Validate your Sender Policy Framework (SPF) record to ensure email deliverability.
Sender Policy Framework (SPF) Validation & Audits
Sender Policy Framework (SPF) is an email validation protocol designed to detect and prevent email spoofing. SPF allows domain owners to publish a list of IP addresses and mail servers authorized to send emails on behalf of their domain in a DNS TXT record.
When an incoming server receives an email, it inspects the sender's domain, retrieves its SPF record, and checks if the sending server's IP matches the authorized list. Our SPF Checker validates your SPF record format, identifies syntax errors, and checks lookup limits.
Frequently Asked Questions
What is the 10 DNS lookup limit in SPF?
The SPF specification (RFC 7208) limits the number of DNS lookups a receiver can perform during verification to 10. Exceeding this limit results in a PermError, causing email bounces.
How do I fix the 'Too many DNS lookups' SPF error?
You can reduce lookups by flattening your SPF record, replacing nested 'include:' mechanisms with direct IP ranges ('ip4:' or 'ip6:'), or using an SPF dynamic flattening service.
What is the difference between ~all and -all in SPF?
The '~all' qualifier indicates a SoftFail (receivers should accept but flag unauthorized mail). The '-all' qualifier indicates a HardFail (receivers should completely reject unauthorized mail).
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