class SendEmail

    {

        static void Main(string[] args)

        {

            string from = "发件人@yingu.com";

            string fromer = "赵海莹";

            string to = "收件人@yingu.com";

            string toer = "刘春喜";

            string Subject = "逾期数据报表";

            string file = string.Concat(System.AppDomain.CurrentDomain.BaseDirectory, "ReprotingTemp\\逾期订单列表.xls");

            string Body = "逾期数据报表";

            //企业邮箱smtp

            string SMTPHost = "smtp.qiye.163.com";

            string SMTPuser = "发件人@yingu.com";

            string SMTPpass = "******（发件人邮箱密码）";

            sendmail(from, fromer, to, toer, Subject, Body, file, SMTPHost, SMTPuser, SMTPpass);

        }

        /// <summary>

        /// C#发送邮件函数

        /// </summary>

        /// <param name="from">发送者邮箱</param>

        /// <param name="fromer">发送人</param>

        /// <param name="to">接受者邮箱</param>

        /// <param name="toer">收件人</param>

        /// <param name="Subject">主题</param>

        /// <param name="Body">内容</param>

        /// <param name="file">附件</param>

        /// <param name="SMTPHost">smtp服务器</param>

        /// <param name="SMTPuser">邮箱</param>

        /// <param name="SMTPpass">密码</param>

        /// <returns></returns>

        private static bool sendmail(string sfrom, string sfromer, string sto, string stoer, string sSubject, string sBody, string sfile, string sSMTPHost, string sSMTPuser, string sSMTPpass)

        {

            ////设置from和to地址

            MailAddress from = new MailAddress(sfrom, sfromer);

            MailAddress to = new MailAddress(sto, stoer);

            ////创建一个MailMessage对象

            MailMessage oMail = new MailMessage(from, to);

            //// 添加附件

            if (sfile != "")

            {

                oMail.Attachments.Add(new Attachment(sfile));

            }

            ////邮件标题

            oMail.Subject = sSubject;

            ////邮件内容

            oMail.Body = sBody;

            ////邮件格式

            oMail.IsBodyHtml = false;

            ////邮件采用的编码

            oMail.BodyEncoding = System.Text.Encoding.GetEncoding("GB2312");

            ////设置邮件的优先级为高

            oMail.Priority = MailPriority.High;

            ////发送邮件

            SmtpClient client = new SmtpClient();

            ////client.UseDefaultCredentials = false;

            client.Host = sSMTPHost;

            //企业邮箱需设置端口，个人邮箱不需要

            client.Port = ;

            client.Credentials = new NetworkCredential(sSMTPuser, sSMTPpass);

            client.DeliveryMethod = SmtpDeliveryMethod.Network;

            try

            {

                client.Send(oMail);

                return true;

            }

            catch (Exception err)

            {

                //Response.Write(err.Message.ToString());

                return false;

            }

            finally

            {

                ////释放资源

                oMail.Dispose();

            }

        }

    }