SPF Record Lookup & Validator
Check if your SPF record is configured correctly and validate email authentication setup
About SPF Records
SPF (Sender Policy Framework) is an email authentication method that helps prevent email spoofing. It allows domain owners to specify which mail servers are authorized to send email on behalf of their domain.
How SPF Works
- You publish an SPF record as a TXT record in your domain's DNS
- When someone receives an email claiming to be from your domain, their mail server checks your SPF record
- The receiving server compares the sending server's IP address against your authorized list
- Based on the match, the email is either accepted, rejected, or marked as suspicious
SPF Tags
| Tag | Description |
|---|---|
| v=spf1 | SPF version identifier (required) |
| ip4: | Authorize IPv4 address or range |
| ip6: | Authorize IPv6 address or range |
| a | Authorize A record of domain |
| mx | Authorize MX record servers |
| include: | Include another domain's SPF policy |
| ~all | Soft fail (mark suspicious) |
| -all | Hard fail (reject) |
Important: SPF has a limit of 10 DNS lookups. Each
include:, a, mx, and exists: mechanism counts as a lookup.
If you exceed this limit, your SPF record will fail validation.
Related Tools
Want Automated SPF Monitoring?
Get instant alerts when your SPF records change or reach DNS lookup limits. Prevent email deliverability issues before they happen.
No credit card required • Free monitoring for 14 days • Setup in 5 minutes