("saatjapoliitika karkass")

olemus
elektronposti protokolli SMTP standardlaiend, mis võimaldab kontrollida saatedomeeni ehtsust
= a standard extension of the e-mail protocol SMTP that allows checking the authenticity of the sender domain

ülevaateid
https://dmarcian.com/what-is-spf/

https://www.sparkpost.com/resources/email-explained/spf-sender-policy-framework/

https://en.wikipedia.org/wiki/Sender_Policy_Framework

https://www.proofpoint.com/us/threat-reference/spf

standard
https://tools.ietf.org/html/rfc7208