<?xml version="1.0"?>
<configuration>
  <appSettings>
    <add/>
  </appSettings>
    <connectionStrings/>
    <system.web>
        <!-- 
            设置 compilation debug="true" 可将调试符号插入
            已编译的页面中。但由于这会 
            影响性能，因此只在开发过程中将此值 
            设置为 true。
        -->
        <compilation debug="true">
        </compilation>
        <!--
            通过 <authentication> 节可以配置 ASP.NET 用来 
            识别进入用户的
            安全身份验证模式。 
       -->
        <authentication mode="Windows"/>
        <!--
            如果在执行请求的过程中出现未处理的错误，
            则通过 <customErrors> 节可以配置相应的处理步骤。具体说来，
            开发人员通过该节可以配置
            要显示的 html 错误页
            以代替错误堆栈跟踪。

        <customErrors mode="RemoteOnly" defaultRedirect="GenericErrorPage.htm">
            <error statusCode="403" redirect="NoAccess.htm" />
            <error statusCode="404" redirect="FileNotFound.htm" />
        </customErrors>
        -->
    </system.web>
  <system.net>
    <mailSettings>
      <smtp from="service@×××.com" deliveryMethod="Network">
        <network host="smtpcom.163xmail.com" password="××××" userName="service@×××.com"  defaultCredentials="false"/>
      </smtp>
    </mailSettings>
  </system.net>
</configuration>

Configuration config =
    WebConfigurationManager.OpenWebConfiguration(HttpContext.Current.Request.ApplicationPath);
            MailSettingsSectionGroup settings =
                (MailSettingsSectionGroup)config.GetSectionGroup("system.net/mailSettings");
            Response.Write("SMTP 主機: " + settings.Smtp.Network.Host + "<br />");
            Response.Write("SMTP 埠號: " + settings.Smtp.Network.Port + "<br />");
            Response.Write("SMTP 帳號: " + settings.Smtp.Network.UserName + "<br />");
            Response.Write("SMTP 密碼: " + settings.Smtp.Network.Password + "<br />");
            Response.Write("預設寄件者:" + settings.Smtp.From + "<br />");

SmtpClient sc;
sc = new SmtpClient();
Response.Write(sc.Host);