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RFC821

RFC821

RFC821

RFC821

1

In fact , the initial specification is a standard (RFC821) first published in 1982 before the Web as we know it even existed .

事实上，最初的规范是 1982年发布的标准（RFC821 ），当时我们还不知道有 Internet 。

2

HELO is the older SMTP verb that is defined in RFC 821.

HELO 是 RFC821 中定义的旧版 SMTP 命令动词。

3

EXPN command (RFC 821 section 3. 3 )

EXPN 命令（RFC821 的 3.3 节）

4

VRFY command (RFC 821 section 3. 3 )

VRFY 命令（RFC821 的 3.3 节）

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