olemus
poolkeeld SPF kirjes poliitikamääranguna
= half-deny in the SPF record as a policy setting

ülevaateid
https://postmarkapp.com/guides/spf#:~:text=~%20SoftFail%2C%20an%20IP%20that%20matches,it%20as%20an%20SPF%20failure.&text=Neutral%2C%20an%20IP%20that%20matches,neither%20pass%20or%20fail%20SPF.

https://help.returnpath.com/hc/en-us/articles/115000460632-How-to-interpret-SPF-authentication-verification-results