Sender Policy Framework

SPF is an extension to Internet e-mail. It prevents unauthorized people from forging your e-mail address (see the introduction). But for it to work, your own or your e-mail service provider's setup may need to be adjusted. Otherwise, the system may mistake you for an unauthorized sender.

Note that there is no central institution that enforces SPF. If a message of yours gets blocked due to SPF, this is because (1) your domain has declared an SPF policy that forbids you to send through the mail server through which you sent the message, and (2) the recipient's mail server detected this and blocked the message.

SPF TEST TOOL

http://www.openspf.org/Tools

http://www.kitterman.com/spf/validate.html?

在DNS裡實際設定的值

新增其它記錄/文字(TEXT)/建立記錄/

記錄名稱(空白)->與父系資料相同或輸入 _spf

文字輸入 v=spf1 ip4:12.34.56.78/32

v=spf1
a
mx
ptr
ip4:12.34.56.78
ptr:mail.aaa.com
mx:mail.aaa.com
a:mail.aaa.com
include:mail.aaa.com
~all

之後利用上面的tools進行測試，看是否pass即可

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