protected void Button1_Click(object sender, EventArgs e){SendSMTPEMail("smtp.qq.com", "861816288@qq.com", "XX密码XXXX", "450940118@qq.com", "123", "用asp.net发送邮件，用qq的smtp.qq.com服务器，测试成功");}public void SendSMTPEMail(string strSmtpServer, string strFrom, string strFromPass, string strto, string strSubject, string strBody){System.Net.Mail.SmtpClient client = new SmtpClient(strSmtpServer);client.UseDefaultCredentials = false;client.Credentials = new System.Net.NetworkCredential(strFrom, strFromPass);client.DeliveryMethod = SmtpDeliveryMethod.Network;System.Net.Mail.MailMessage message = new MailMessage(strFrom, strto, strSubject, strBody);message.BodyEncoding = System.Text.Encoding.UTF8;message.IsBodyHtml = true;client.Send(message);}//第一个参数是邮箱服务器//第二个参数发件人的帐号//第三个参数发件人密码//第四个参数收件人帐号//第五个参数主题//第六个参数内容.

 public void SendMailUseZj(){System.Net.Mail.MailMessage msg = new System.Net.Mail.MailMessage();//msg.To.Add("lcvfb@qq.com");msg.To.Add(“这里填发给地址如WQER@qq.com”);// msg.To.Add("b@b.com");//可以发送给多人 //msg.CC.Add("c@c.com");//可以抄送给多人 msg.From = new MailAddress("asdasd@126.com", "SFADSXCVXXV", System.Text.Encoding.UTF8);/* 上面3个参数分别是发件人地址（可以随便写），发件人姓名，编码*/msg.Subject = "aaaaa" ;//邮件标题 msg.SubjectEncoding = System.Text.Encoding.UTF8;//邮件标题编码 msg.Body = "adsssssssss";//邮件内容 msg.BodyEncoding = System.Text.Encoding.UTF8;//邮件内容编码 msg.IsBodyHtml =true;//是否是HTML邮件 //msg.Priority = MailPriority.High;//邮件优先级 SmtpClient client = new SmtpClient();client.Credentials = new System.Net.NetworkCredential("AAAAAAAA@126.com", "77777777"); //发送的邮箱账号密码。这肯定得写你自己的,我用的126client.Host = "smtp.126.com";object userState = msg;try{//client.SendAsync(msg, userState);client.Send(msg);Label1.Text = "发送成功！！";}catch (System.Net.Mail.SmtpException ex){Label1.Text = "发送失败!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!";//前台的标签，不用说了吧}}

POP3：pop.163.com
SMTP：smtp.163.com

新浪免费邮箱发信(smtp)服务器的地址为：smtp.sina.com

新浪免费邮箱收信(pop3)服务器的地址为：pop.sina.com