认证邮件协议，指一个发送方要将消息M与收方收到的证据进行交换的协议。

Certified mail protocol is fair exchange of a message m for a receipt.

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从第一次交换电子邮件以来。

From the very first email exchange.

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电子合同的基本形式有两种：电子数据交换和电子邮件。

It has two kinds of basic form: the exchanging of electronic data and E-mail.

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电子合同的基本形式有两种：电子数据交换和电子邮件。

It has two kinds of basic form: the exchanging of electronic data and E-mail.

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