Free SPF record checker
Look up your domain's SPF record, see which servers are authorized to send on your behalf, and catch misconfiguration errors before they hurt deliverability.
Full authentication monitoring (SPF, DKIM, DMARC) is available in the ValidPeak dashboard.
Frequently asked questions
What is an SPF record?
An SPF (Sender Policy Framework) record is a DNS TXT record that lists which mail servers are authorized to send email on behalf of your domain. When a receiving server gets an email claiming to be from your domain, it checks the SPF record to verify the sending server is authorized.
What is the 10-lookup limit in SPF?
RFC 7208 limits SPF to 10 DNS lookups per evaluation. Each include:, a, mx, ptr, and exists mechanism causes a lookup. Exceeding 10 results in a PermError, which causes SPF to fail. Use flattening or consolidate includes to stay under the limit.
Does SPF alone prevent email spoofing?
No. SPF only checks the envelope sender (MAIL FROM), not the header From address that recipients see. You also need DKIM and DMARC to fully protect against domain spoofing. DMARC requires SPF or DKIM to align with the header From address.