What this tool checks
- SPF TXT records
- Multiple record warnings
- Estimated DNS lookup mechanisms
- All mechanism guidance
Email Deliverability Tools
SPF Checker
Find and analyse SPF records for sender authorisation.
Run the check
Enter a public target. Checks are a point-in-time sample; private and internal addresses are blocked.
Why it matters
SPF helps receiving mail servers identify authorised senders for your domain.
Plain-English examples
- Check whether Microsoft 365 or a website platform can send mail
Recommended fixes
- Use one SPF record only
- Keep DNS lookup mechanisms under 10
- End with an appropriate all mechanism
Understanding the result
Use findings as a starting point, confirm the intended configuration with your provider, and retest after a change. A successful check does not guarantee security, delivery, uptime or search rankings. Results depend on public DNS and what the server exposes at the time of the check.
Related tools
Run these checks next for a fuller picture.
MX Checker
Find mail exchanger records and priorities for a domain.
Run checkDKIM Checker
Check a DKIM selector under selector._domainkey.domain.
Run checkDMARC Checker
Check DMARC policy, reporting tags and enforcement readiness for your domain email.
Run checkMTA-STS Checker
Check MTA-STS DNS and policy file availability.
Run checkNeed help fixing the result?
