1 基础知识

– SPF为英文Sender Policy Framework的简称
– SPF是电子邮件系统中发送方策略框架的缩写
– SPF的内容写在DNS的txt类型的记录里面
– SPF作用是防止别人伪造你的邮件地址进行发信，是一种非常高效的反垃圾邮件解决方案

2 验证方法

nslookup -q=txt cmdschool.org

可见如下显示，

Server:         100.100.2.136
Address:        100.100.2.136#53

Non-authoritative answer:
cmdschool.org      text = "v=spf1 ip4:47.90.98.232 include:spf.cmdschool.org -all"

Authoritative answers can be found from:

参阅文档
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https://qiye.163.com/help/e89b84.html
https://help.aliyun.com/document_detail/36771.html