Valid
- v=spf1 include:_spf.google.com -all
web validator
SPF Record Validator
Validate SPF TXT records to ensure v=spf1 prefix and valid mechanisms.
Results
Processing…- Status
- Processing...
- Details
- Processing...
- Mechanisms
- Processing...
- Has all/~all
- Processing...
How to use this validator
- Paste the SPF TXT record.
- Run validate to check prefix, mechanisms, and final all/~all/-all/?all.
- If invalid, add v=spf1 or correct unknown mechanisms, then re-run.
Rules & checks
Requires v=spf1 at the start.
Supports a, mx, include:, ip4:, ip6:, exists:, redirect=, exp=, and all/~all/-all/?all.
Flags unknown mechanisms and missing content.
Runs fully client-side; no data is stored.
Inputs explained
SPF TXT record
Paste the full SPF string (e.g., v=spf1 include:_spf.google.com -all). Avoid secrets; this is structure-only.
When to use it
- QA DNS TXT records before publishing
- Check support tickets for SPF issues
- Validate automated DNS templates
Common errors
- No v=spf1 prefix
- Unknown mechanisms (typos or unsupported)
- Missing all/~all/-all terminator
Limitations
- Structure-only validation; does not resolve includes or count DNS lookups.
- Does not verify DNS record size limits.
Tips
- End with -all or ~all to avoid soft fails
- Limit the number of include: mechanisms to reduce DNS lookups
Examples
Missing v=spf1
- include:_spf.google.com -all -> Invalid
Unknown mech
- v=spf1 foo=bar -all -> Invalid
Deep dive
This SPF validator checks v=spf1 prefix, known mechanisms, and all/~all terminators entirely in your browser.
Use it to catch typos and missing terminators before publishing SPF TXT records.
FAQs
- Is this uploaded?
- No. Parsing happens in your browser only.
Related validators
All validation happens in your browser. No data is sent, logged, or stored.
Structure-only validation; does not resolve includes or count DNS lookups.