/// <summary>

    /// 发送邮件

    /// </summary>

    public class MailHelper

    {

        #region 私有变量

        private string _mailTo;            //接收方

        private string _mailFrom;          //发送方

        private string _subject;           //标题

        private string _body;              //内容

        private string _username;          //邮件用户

        private string _pwd;               //密码

        private string _smtpclient;        //smtp服务器名字

        private string _youname;           //关联姓名

        private bool _bodyhtml = false;    //正文是否为html格式

        private List<string> _listCc = new List<string>();//抄送

        //编码暂硬性规定为GB2312

        private Encoding _encoding = Encoding.GetEncoding();

        #endregion

        #region 私有属性

        /// <summary>

        /// smtp服务器

        /// </summary>

        private string SmtpClient

        {

            set

            {

                //格式如smtp.sina.com

                Regex regex = new Regex(@"^smtp(\.([a-zA-Z0-9])+){2}$");

                if (regex.IsMatch(value))

                    this._smtpclient = value;

                else

                    throw new ArgumentException("smtp服务器设置失败");

            }

        }

        /// <summary>

        /// 发送方

        /// </summary>

        private string MailTo

        {

            set

            {

                if (IsValidEMail(value))

                    this._mailTo = value;

                else

                    throw new ArgumentException("发送方设置错误");

            }

        }

        /// <summary>

        /// 用户名

        /// </summary>

        private string UserName

        {

            set

            {

                if (string.IsNullOrEmpty(value))

                    throw new ArgumentException("用户名不能为空");

                if (!this._mailFrom.StartsWith(value))

                    throw new ArgumentException("用户名设置和发送方不匹配");

                this._username = value;

            }

        }

        /// <summary>

        /// 密码

        /// </summary>

        private string Pwd

        {

            set

            {

                if (string.IsNullOrEmpty(value))

                    throw new ArgumentException("密码不能为空");

                this._pwd = value;

            }

        }

        /// <summary>

        /// 发送给

        /// </summary>

        private string MailFrom

        {

            set

            {

                if (IsValidEMail(value))

                    this._mailFrom = value;

                else

                    throw new ArgumentException("接收方设置错误");

            }

        }

        /// <summary>

        /// 关联姓名

        /// </summary>

        private string YouName

        {

            set

            {

                if (string.IsNullOrEmpty(value))

                    this._youname = this._username;

                else

                    this._youname = value;

            }

        }

        #endregion

        #region 私有方法

        /// <summary>

        /// 检测email格式

        /// </summary>

        /// <param name="email">email</param>

        /// <returns>true为正确</returns>

        private bool IsValidEMail(string email)

        {

            Regex regex = new Regex(@"\w+([-+.]\w+)*\w{2,}@\w+([-.]\w+)*\.\w+([-.]\w+)*");

            if (regex.IsMatch(email))

                return true;

            else

                return false;

        }

        #endregion

        #region 公共属性

        /// <summary>

        /// 标题

        /// </summary>

        public string Subject

        {

            set

            {

                if (string.IsNullOrEmpty(value))

                    throw new ArgumentException("标题不能为空");

                this._subject = value;

            }

        }

        /// <summary>

        /// 正文

        /// </summary>

        public string Body

        {

            set

            {

                if (string.IsNullOrEmpty(value))

                    throw new ArgumentException("正文不能为空");

                this._body = value;

            }

        }

        #endregion

        #region 公共方法

        /// <summary>

        /// 构造函数

        /// </summary>

        /// <param name="smtpclient">smtp服务器,格式如"smtp.sina.com"</param>

        /// <param name="mailFrom">发送方,格式如"mymail@sina.com"</param>

        /// <param name="username">登入名,必填,注意和发送方匹配</param>

        /// <param name="pwd">密码,必填</param>

        /// <param name="mailTo">接收方,格式如"youmail@sina.com"</param>

        /// <param name="subject">标题,最好别为空</param>

        /// <param name="body">正文,必填</param>

        /// <param name="bodyhtml">正文是否为html格式</param>

        /// <param name="youName">关联姓名, 选填</param>

        public MailHelper(string smtpclient, string mailFrom,

            string username, string pwd, string mailTo,

            string subject, string body,

            bool bodyhtml, string youName)

        {

            this.SmtpClient = smtpclient;

            this.MailFrom = mailFrom;

            this.UserName = username;

            this.Pwd = pwd;

            this.MailTo = mailTo;

            this.Subject = subject;

            this.Body = body;

            this.YouName = youName;

            this._bodyhtml = bodyhtml;

        }

        /// <summary>

        /// 添加抄送邮箱, 可多次调用

        /// </summary>

        /// <param name="mailCc">抄送的email</param>

        public void AddMmailCc(string mailCc)

        {

            if (IsValidEMail(mailCc))

                this._listCc.Add(mailCc);

            else

                throw new ArgumentException("抄送'" + mailCc + "'地址错误");

        }

        /// <summary>

        /// 发送邮件

        /// </summary>

        /// <returns>true-发送成功</returns>

        public void Send()

        {

            Encoding encoding = this._encoding;

            MailMessage Message = new MailMessage(

            new MailAddress(this._mailFrom, this._youname, this._encoding),

            new MailAddress(this._mailTo));

            Message.SubjectEncoding = this._encoding;

            Message.Subject = this._subject;

            Message.BodyEncoding = this._encoding;

            Message.Body = this._body;

            Message.IsBodyHtml = this._bodyhtml;

            foreach (string strCc in _listCc)

            {

                Message.CC.Add(new MailAddress(strCc));

            }

            SmtpClient smtpClient = new SmtpClient(this._smtpclient);

            smtpClient.Credentials = new NetworkCredential(this._username, this._pwd);

            smtpClient.Timeout = ;

            smtpClient.Send(Message);

            //异步调用, 避免阻塞

            //Timeout 属性对 SendAsync 调用没有影响

            //smtpClient.SendAsync(Message, null);

        }

        #endregion

    }

 MailHelper mail = new MailHelper("smtp.sina.cn", "邮箱帐号@sina.cn", "登录帐号", "登录密码",  "对方邮箱帐号", "邮件标题", "<a href='http://www.baidu.com'>点一点</a>", true, "");

 mail.Send();