public class Email

    {

        /// <summary>

        /// 发送方发送方服务器地址

        /// </summary>

        public string strHost { get; set; }

        /// <summary>

        /// 发送方帐号

        /// </summary>

        public string strAccount { get; set; }

        /// <summary>

        /// 发送方密码

        /// </summary>

        public string strPwd { get; set; }

        /// <summary>

        /// 发送方邮件地址

        /// </summary>

        public string strFrom { get; set; }

        /// <summary>

        /// 接收方邮件地址

        /// </summary>

        public string to { get; set; }

        /// <summary>

        /// 邮件标题

        /// </summary>

        public string title { get; set; }

        /// <summary>

        /// 邮件正文内容

        /// </summary>

        public string content { get; set; }

        ///// <summary>

        ///// 附件

        ///// </summary>

        //public string sfile { get; set; }

        /// <summary>

        /// 发送邮件

        /// </summary>

        /// <param name="strHost">发送方发送方服务器地址</param>

        /// <param name="strAccount">发送方帐号</param>

        /// <param name="strPwd">发送方密码</param>

        ///  <param name="strFrom">发送方邮件地址</param>

        /// <param name="to">接收方邮件地址</param>

        /// <param name="title">邮件标题</param>

        /// <param name="content">邮件正文内容</param>

        /// <param name="sfile">邮件附件</param>

        /// <returns></returns>

        public string sendMail(Email e)//string strHost, string strAccount, string strPwd, string strFrom, string to, string title, string content

        {

            SmtpClient smtpClient = new SmtpClient();

            if (string.IsNullOrEmpty(e.strHost))

            {

                e.strHost = "smtp.sina.cn";//新浪测试

            }

            if (string.IsNullOrEmpty(e.strAccount))

            {

                e.strAccount = "xxx";

            }

            if (string.IsNullOrEmpty(e.strPwd))

            {

                e.strPwd = "xxx";

            }

            if (string.IsNullOrEmpty(e.strFrom))

            {

                e.strFrom = "xxx";

            }

            smtpClient.DeliveryMethod = SmtpDeliveryMethod.Network;//指定电子邮件发送方式

            smtpClient.Host = e.strHost; ;//指定SMTP服务器

            smtpClient.UseDefaultCredentials = true;

            smtpClient.Credentials = new System.Net.NetworkCredential(e.strAccount, e.strPwd);//用户名和密码

            MailMessage mailMessage = new MailMessage(e.strFrom, e.to);

            mailMessage.Subject = e.title;//主题

            mailMessage.Body = e.content;//内容

            mailMessage.BodyEncoding = System.Text.Encoding.UTF8;//正文编码

            mailMessage.IsBodyHtml = true;//设置为HTML格式

            mailMessage.Priority = MailPriority.High;//优先级

            ////// 添加附件

            //if (e.sfile != "")

            //{

            //    mailMessage.Attachments.Add(new Attachment(e.sfile));

            //}

            try

            {

                smtpClient.Send(mailMessage);

                mailMessage.Dispose();//释放资源

                return "成功";

            }

            catch (Exception ex)

            {

                return ex.ToString();

            }

        }

    }

                    Email email = new Email();//实例化我们上面的Email类

                    email.strHost = "smtp.163.com";发送方服务器地址

                    email.strAccount = "用户名";发送方用户名 ps:邮箱地址为88888888@163.com 用户名则为：88888888

                    email.to = "收件人邮箱地址";//你要给谁发邮件

                    email.title = “title”;//这个不做解释

                    email.strPwd = "";//邮箱授权码，这个在下面解释

                    email.strFrom = "发送方的邮件地址";

                    email.content = @"邮件内容（字写多点，字数少发不成功，不知道为什么，有朋友知道的给我留言，谢谢）";

                    email.sendMail(email);