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AuthenticationA free tool by NullFortis
SPF Checker
Validate your SPF record
What is it?
SPF (Sender Policy Framework) is a DNS TXT record that lists exactly which mail servers are allowed to send email on behalf of your domain.
Why it matters
Without it, there's nothing telling a receiving mail server whether a message claiming to be from your domain actually came from a server you authorized.
Impact if ignored
A missing or misconfigured SPF record makes it far easier for attackers to spoof your domain in phishing and business-email-compromise attempts, and can cause your own legitimate email to land in spam because receivers can't verify it.
Common use cases
- Confirm a new marketing platform or CRM is correctly authorized as a sender
- Audit your record before switching email providers
- Verify nothing broke after adding a new sending service