Why SPF Fails and How to Fix It
SPF fails when the sending mail server IP is not authorized in your domain’s SPF record. This often causes mail to land in spam or be rejected.
Common Causes
- Missing sending provider in SPF
- Wrong
include:mechanism - DNS lookup limit exceeded (max 10)
- Using
-alltoo early while setup is incomplete
How to Fix SPF
- Add the correct provider include (example:
include:_spf.google.com) - Remove unused includes and flatten when needed
- Keep total SPF lookups ≤ 10
- Start with
~all(softfail) then move to-allwhen verified