asp.net 发送邮件问题

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我在网站找的代码测试,有错不知道如何修改,请帮忙!!!

在设计页面;
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="sendEmail.aspx.cs" Inherits="sendEmail" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
邮箱地址: <asp:TextBox ID="txtaddress" runat="server"></asp:TextBox> <br /> <br />
抄送志: <asp:TextBox ID="txtto" runat="server"></asp:TextBox><br /> <br />
邮件主题: <asp:TextBox ID="txttitle" runat="server"></asp:TextBox><br /> <br />
邮件内容: <asp:TextBox ID="txtcontent" runat="server"></asp:TextBox><br /> <br />
<asp:Button ID="btn1" runat="server" Text="发送" onclick="btn1_Click" />


</div>
</form>
</body>
</html>


在后台:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Net.Mail;
using System.Net;

public partial class sendEmail : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{

}
protected void btn1_Click(object sender, EventArgs e)
{
MailMessage mymail = new MailMessage();

mymail.From = new MailAddress("18301584131@163.com");
mymail.To.Add(new MailAddress(this.txtaddress.Text));
mymail.Subject = this.txttitle.Text;
mymail.SubjectEncoding = System.Text.Encoding.UTF8;
mymail.Body = this.txtcontent.Text;
mymail.CC.Add(new MailAddress(this.txtaddress.Text));

mymail.IsBodyHtml = true;
mymail.Priority = MailPriority.Normal;

//创建一个邮件服务器类

SmtpClient myclient = new SmtpClient();
// myclient.Host = "SMTP.163.com";
myclient.Port = 25;

myclient.Credentials = new NetworkCredential("18301584131@163.com", "zxt52133122");

myclient.Send(mymail);

}
}


每次会出现:


什么原因???而且myclient.Credentials = new NetworkCredential("18301584131@163.com", "zxt52133122");里面的邮箱地址是发件人的邮箱吗?
...全文

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