Validate the Sender Policy Framework (SPF) TXT record for any domain. Detect misconfigurations instantly.
SPF (Sender Policy Framework) is an email authentication protocol. A domain's SPF record lists all the IP addresses and mail servers that are authorized to send email on behalf of that domain. When an email is received, the receiving mail server checks the SPF record to verify the sender is authorized — helping prevent email spoofing and phishing.
| Qualifier | Mechanism | Meaning |
|---|---|---|
+ (default) | Pass | Authorized to send — deliver the email |
- | Fail | Not authorized — reject the email |
~ | SoftFail | Probably not authorized — accept but mark as suspicious |
? | Neutral | No statement on authorization |
| Common Mechanisms: ip4, ip6, a, mx, include, all, redirect, exists | ||