esmtp

ehlo is the extended simple message transfer protocol (esmtp) verb that is defined in rfc 2821.

EHLO是扩展的简单邮件传输协议（ESMTP）命令动词，该命令动词是在RFC2821中定义的。

also, the extended simple mail transfer protocol (esmtp) command x-link2state must not be blocked by a firewall.

此外，防火墙不得阻止扩展简单邮件传输协议（ESMTP）命令X-LINK2STATE。

this extension (x-exps) is implemented as a protocol sink in exchange 2000, and is a microsoft proprietary esmtp verb.

此扩展（X-EXPS）在Exchange2000中作为协议接收器实现，并且是Microsoft专有的ESMTP动作。

your exchange server then responds by listing the smtp and esmtp verbs that it supports.

然后，Exchange服务器通过列出它所支持的SMTP和ESMTP动作来进行响应。

however, the limitation of the x-exch50 blob is that it is a proprietary extended simple mail transfer protocol (esmtp) verb.

但是，X-EXCH50BLOB的局限性在于，它是专有的扩展简单邮件传输协议（ESMTP）动词。