RFC821-简单邮件传输协议SMTP中文版-2
本文出自: 作者: (2001-11-23 08:08:00) 4.1.2. COMMAND语法格式 命令是由命令码和其后的参数域组成的。命令码是四个字母组成的，不区别 大小写。因为下面的命令的作用是相同的： MAIL Mail mail MaIl mAIl 这对于引导任何参数值的标记也是适用的，如TO和to就是一样的。命令码和 参数由一个或多个空格分开。然而在回复路径和转发路径中的参数是区别大小写 的。特别是在一些主机上，"smith"和"Smith"就根本不是一个用户。 参数域由不定长的字符串组成，它由
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Outlook emails lost from control panel in Windows 11
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