asp.net
using System.web.Mail;
MailMessage msg = new MailMessage();
//发送方地址(如test@163.com)
msg.From = "zdyguilong@163.com";
//接收方地址(如test@163.com)
msg.To = "zdyguilong@163.com";
//正文内容类型
msg.BodyFormat = MailFormat.Html;
//正文内容编码
msg.BodyEncoding = System.Text.Encoding.Default;
//主题
msg.Subject = "张大宇向您问好";
//内容
msg.Body = "<html><head><META content=zh-cn http-equiv=Content-Language><meta http-equiv='Content-Type' content='text/html; charset=gb2312'><style type=text/css>A:link { FONT-SIZE: 9pt; TEXT-DECORATION: none; color: #000000}A:visited {FONT-SIZE: 9pt; TEXT-DECORATION: none; color: #666666}A:hover {COLOR: #ff6600; FONT-SIZE: 9pt; TEXT-DECORATION: underline}BODY {FONT-SIZE: 9pt} --></style></head><body><font color=red>用户名：" + UserName.Text.Trim() + "</font><br><font color=green>密码：" + strUserPsw.ToString() + "</font><br><b>验证地址：</b><a href='http://192.168.1.98/AllFiles/Member/CheckFromEmail.aspx?UserName=" + UserName.Text.Trim() + "'target=_blank>http://192.168.1.98/AllFiles/Member/CheckFromEmail.aspx?UserName=" + UserName.Text.Trim() + "</a>。如果您不能点击链接进行跳转，请把这个地址粘贴到浏览器的地址栏直接访问。<br><font color=red>此邮件不必回复，谢谢。</font></body></html>";
//设置为需要用户验证
msg.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpauthenticate", "1");
//设置验证用户名
msg.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendusername", "zdyguilong");
//设置验证密码
msg.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendpassword", "123456");
//邮件服务器地址(如smtp.163.com)
SmtpMail.SmtpServer = "smtp.163.com";
//发送
SmtpMail.Send(msg);
//Response.Write("<script language='javascript'>alert('注册成功');window.location='../default.aspx'</script>");