电子邮件 系统架构 - SERP Analysis

https://blog.csdn.net/weixin_43914604/article/details/105896201

https://blog.exsvc.cn/article/email-system-architecture.html

https://www.jianshu.com/p/98b85ae37465

https://blog.csdn.net/qq_43539664/article/details/137194228

https://www.zoho.com.cn/mail/articles/principle.html

https://learn.microsoft.com/zh-cn/exchange/architecture/architecture

https://www.cnblogs.com/davidwang456/p/5000016.html

https://www.enfocus.com/manuals/UserGuide/SW/17-zhCN/zh-cn/common/sw/reference/r_email_message_schema.html

https://www.cnblogs.com/1314520xh/p/18916717

https://www.mailabc.cn/blog/2024/06/15/%E9%82%AE%E4%BB%B6%E7%B3%BB%E7%BB%9F%E9%AB%98%E5%8F%AF%E7%94%A8%E6%9E%B6%E6%9E%84%E6%96%B9%E6%A1%88/