SPF Checker Guide
Learn how SPF records authorize senders and how to interpret common SPF findings from an email DNS check.
What SPF protects
SPF tells receivers which sources are allowed to send mail for a domain. A clear SPF record can improve trust, while multiple SPF records or broad mechanisms can create risk.
- Use one SPF TXT record per domain.
- Avoid +all because it authorizes any sender.
- Review includes and redirects during vendor changes.