smtp 和 pop3 的区别？

[达夫_zh]

如题

[达夫_zh]

学习啊

 
 <script type="text/javascript"><!--
            google_ad_client = "pub-1076724771190722";
            google_ad_width = 468;
            google_ad_height = 60;
            google_ad_format = "468x60_as";
            google_ad_channel = "2163438289";
            google_page_url = document.location;
            google_color_border = "336699";
            google_color_bg = "FFFFFF";
            google_color_link = "0000FF";
            google_color_url = "008000";
            google_color_text = "000000";
  //-->    </script>

[达夫_zh]

<script type="text/javascript" src="http://pagead2.googlesyndication.com/pagead/show_ads.js"></script>

[达夫_zh]

一个用来邮件传输，一个用在用户接收邮件

<script type="text/javascript" src="http://pagead2.googlesyndication.com/pagead/show_ads.js"></script>