https://saucer-man.com/information_security/452.html
现在的问题是 如何突破 域名的SPF记录。
nslookup -type=txt accountprotection.microsoft.com 223.5.5.5
服务器: public1.alidns.com
Address: 223.5.5.5
非权威应答:
accountprotection.microsoft.com canonical name = mail.msa.msidentity.com
mail.msa.msidentity.com text =
"v=spf1 include:spf-a.hotmail-int.com include:spf-a.hotmail.com include:spf-c.hotmail.com include:spf-d.hotmail.com include:spf.protection.outlook.com -all"