简单Mail传输协议。目标是向用户提供高效、可靠的
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件传输。SMTP的一
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特点是它能够在传
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中接力传
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件,即
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件可以通过不同网络上的主机接力式传
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。
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在两种情况下:一是电子
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件从客户机传输到服务器;二是从某一
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服务器传输到另一
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服务器。SMTP是
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请求/响应协议,它监听25号端口,用于接收用户的Mail请求,并与远端Mail服务器建立SMTP连接。
Smtp
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机制
SMTP通常有两种
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模式:发
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SMTP和接收SMTP。具体
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方式为:发
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SMTP在接到用户的
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件请求后,判断此
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件是
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