发送邮件失败无法连接到远程服务器

[fivecapable]

如题，代码如下：
using System.Net.Mail;
try
{
MailAddress From = new MailAddress("[e-mail]");
MailAddress To = new MailAddress(txtEmail.Text);
string Subject = "感谢您的使用!";
string Body = "请点击以下连接进行注册确认!<br><a href='http://localhost:1326/pingdgng/RegistorReturn.aspx?un=" + txtEmail.Text + "&up=" + pwd.Text + "'>点击此处</a>";

// 设置邮件的发送及接收地址
MailMessage mailObj = new MailMessage(From.Address, To.Address, Subject, Body);

mailObj.Priority = MailPriority.High;


//构建一个认证实例，这里是smtp服务器的地址
SmtpClient smtp = new SmtpClient("smtp.163.com");
switch (To.Host)
{
case "qq.com":
smtp = new SmtpClient("qq.com");
break;
case "126.com":
case "163.com":
smtp = new SmtpClient("smtp.163.com");
break;
case "gmail":
smtp = new SmtpClient("smtp.gmail.com");
break;
}

//将认证实例赋予mailClient 这里是登陆smtp的用户名和密码
System.Net.NetworkCredential nc = new System.Net.NetworkCredential("[e-mail]", "123456");
smtp.Credentials = nc;
smtp.Send(mailObj);
Response.Write("发送成功！");
}
catch (Exception exp)
{
Response.Write(exp.Message);
}

[fivecapable]

自己顶一下，有谁知道的，说一下嘛，谢谢了

[宝_爸]

gmail的
SMTPServer.Port = 587
SMTPServer.EnableSsl = True

参考:
http://geekswithblogs.net/TakeNote/archive/2007/07/16/113974.aspx

[lsy51213]

我也遇到跟你一样问题拉.不知是什么解决的?

[jackchang234987]

楼主是怎么解决的啊，可否分享一下你的解决方法，谢谢