SPF: Sender Policy Framework

领测软件测试网 SPF is Sender Policy Framework

SPF fights return-path address forgery and makes it easier to identify spoofs.
Domain owners identify sending mail servers in DNS.
SMTP receivers verify the envelope sender address against this information, and can distinguish authentic messages from forgeries before any message data is transmitted.

http://spf.pobox.com/

文章来源于领测软件测试网 https://www.ltesting.net/