MailMessage mailMsg = new MailMessage(); 
  //設置收件人的郵件地址 
  mailMsg.To = "bailichunwow@qq.com "; 
   
  //設置發送者的郵件地址 
  mailMsg.From = "bailichun@vip.qq.com "; 
  //設置郵件主題 
  mailMsg.Subject = "測試 "; 
   
  //設置郵件內容 
  mailMsg.Body = "內容 ";
  mailMsg.BodyFormat = MailFormat.Text;
  mailMsg.Priority = MailPriority.Normal;
  try
  {
  //設置發送郵件服務器 
  SmtpMail.SmtpServer = "localhost";
  //發送郵件 
  SmtpMail.Send(mailMsg);
  }
  catch
  {
  }
 
//一款完整發送郵件代碼
MailObj _mail = new MailObj();
        _mail.sendMail("lxx@qq.com", "測試", "b>內容/b>");
        _mail.Dispose();
//核心代碼
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Collections.Generic;
using System.Net.Mail;
using System.Text;
namespace EC
{
    /// summary>
    ///郵件發送
    /// /summary>
    public class MailObj
    {
        private string _strHost = string.Empty;
        private string _strAccount = string.Empty;
        private string _strPwd = string.Empty;
        private string _strFrom = string.Empty;
        #region 構造與析構函數
        public MailObj()
        {
            _strHost = "smtp.163.com";   //STMP服務器地址
            _strAccount = "aa";       //SMTP服務帳號
            _strPwd = "123456";       //SMTP服務密碼
            _strFrom = "aa@163.com";  //發送方郵件地址
        }
        /// summary>
        /// 發送郵件購造函數
        /// /summary>
        /// param name="strHost">STMP服務器地址:smtp.163.com/param>
        /// param name="strAccount">SMTP服務帳號:liugongxun/param>
        /// param name="strPwd">SMTP服務密碼:123456/param>
        /// param name="strFrom">發送方郵件地址:liugongxun@163.com/param>
        public MailObj(string strHost, string strAccount, string strPwd, string strFrom)
        {
            _strHost = strHost;
            _strAccount = strAccount;
            _strPwd = strPwd;
            _strFrom = strFrom;
        }

        ~MailObj()
        {
            Dispose();
        }
        public void Dispose()
        {
            GC.SuppressFinalize(this);
        }
        #endregion
        #region 發送郵件
        public bool sendMail(string to, string title, string content)
        {
            SmtpClient _smtpClient = new SmtpClient();
            _smtpClient.DeliveryMethod = SmtpDeliveryMethod.Network;//指定電子郵件發送方式
            _smtpClient.Host = _strHost;//指定SMTP服務器
            _smtpClient.Credentials = new System.Net.NetworkCredential(_strAccount, _strPwd);//用戶名和密碼
            MailMessage _mailMessage = new MailMessage(_strFrom, to);
            _mailMessage.Subject = title;//主題
            _mailMessage.Body = content;//內容
            _mailMessage.BodyEncoding = System.Text.Encoding.UTF8;//正文編碼
            _mailMessage.IsBodyHtml = true;//設置為HTML格式
            _mailMessage.Priority = MailPriority.High;//優先級
            try
            {
                _smtpClient.Send(_mailMessage);
                return true;
            }
            catch
            {
                return false;
            }
        }
        #endregion
    }
}