Gmail安全校验

https://toolbox.googleapps.com/apps/checkmx/check?domain=test.com&dkim_selector=

使用From Fields进行Gmail邮件伪造

https://www.360zhijia.com/anquan/431382.html

smtp.mailfrom   From  没做校验

Gmail的bug  没识别 发件人

SPF records

https://support.google.com/a/answer/33786?hl=en
https://support.google.com/a/answer/33786?hl=ch

DKIM 加强安全

https://support.google.com/a/answer/2466563  启用 DMARC

https://www.cnblogs.com/dmarcly/p/10947796.html  DMARC 是什么？