What is SPF?
SPF (Sender Policy Framework) is a DNS TXT record that lists the servers allowed to send email on behalf of your domain.
Why businesses care
It gives receiving servers a published list to check, which reduces forged mail and helps your legitimate email avoid spam folders.
Example
v=spf1 include:_spf.google.com -allHow to check
Look up TXT records on your root domain for one beginning v=spf1, or run the SPF checker.
How to fix
Publish exactly one SPF record that includes every service that sends as you and ends with -all (or ~all while testing).
Common mistakes
- Two SPF records
- Ending with +all
- Exceeding the 10-DNS-lookup limit with many includes
- Forgetting a sender such as your invoicing tool
Sources
Check it with SPF Checker
Validate your SPF record: syntax, multiple-record errors, risky +all endings and DNS-lookup limit indicators. Free SPF check.
Open SPF Checker