Free tool
SPF record checker.
Enter a domain to check its SPF record, verify syntax, and see authorized sending sources.
What is SPF?
Sender Policy Framework tells receiving mail servers which IP addresses and domains are allowed to send email on your behalf.
Why it matters
Missing or broken SPF records increase spam placement and can cause outright rejection by Gmail and Outlook.
Common mistake
Multiple SPF records. There should be exactly one TXT record starting with v=spf1.