SMTP email from C#

       /// <summary>

        /// 一人一附件发送邮件

        ///  2017-05-17 涂聚文  GeovinDu

        /// </summary>

        /// <param name="To">接收邮件人</param>

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

        /// <param name="Msg">邮件内容</param>

        /// <param name="bodyHtml">是否網頁</param>

        /// <param name="AttachmentStream"></param>

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

        /// <returns></returns>

        public static bool SendEmaildu(string To, string Subject, string Msg, bool bodyHtml, MemoryStream AttachmentStream,string AttachmentFileName)

        {

            bool SendOk = false;

            try

            {

                System.Net.Mail.MailMessage newMsg = new System.Net.Mail.MailMessage(System.Configuration.ConfigurationManager.AppSettings["mailCfg"], To, Subject, Msg);

                newMsg.BodyEncoding = System.Text.Encoding.UTF8;

                newMsg.HeadersEncoding = System.Text.Encoding.UTF8;

                newMsg.SubjectEncoding = System.Text.Encoding.UTF8;

                System.Net.Mail.SmtpClient smtpClient = new System.Net.Mail.SmtpClient();

                //smtpClient.Credentials = new NetworkCredential("geovindu@dusystem.com","888888");

                //smtpClient.Port = 25;

                //smtpClient.EnableSsl = false;

                if (AttachmentStream != null && AttachmentFileName != null)

                {

                    // ADD AN ATTACHMENT.

                    //String sFile = @"C:\Source\LNS_IS.TXT";

                    //MailAttachment oAttch = new MailAttachment(sFile, MailEncoding.Base64);

                    //string filePath = @"C:\TestEmail\SKYPE11月黑咭生日會員.xls";

                    //MemoryStream memStream = new MemoryStream();

                    //using (FileStream fileStream = File.OpenRead(filePath))

                    //{

                    //    memStream.SetLength(fileStream.Length);

                    //    fileStream.Read(memStream.GetBuffer(), 0, (int)fileStream.Length);

                    //}

                    newMsg.Attachments.Add(new Attachment(AttachmentStream, AttachmentFileName)); //MediaTypeNames.Image.Jpeg)                

                    //System.Net.Mail.Attachment attachment = new System.Net.Mail.Attachment(AttachmentStream, AttachmentFileName);

                    //System.Net.Mime.ContentDisposition disposition = attachment.ContentDisposition;

                    //disposition.FileName = AttachmentFileName;

                    //disposition.DispositionType = System.Net.Mime.DispositionTypeNames.Attachment;

                    //newMsg.Attachments.Add(attachment);

                }

                newMsg.IsBodyHtml = bodyHtml;

                smtpClient.Send(newMsg);

                SendOk = true;

                //return SENT_OK;

            }

            catch (Exception ex)

            {

                ex.Message.ToString();

                AttachmentStream.Close();

                SendOk = false;

                //"Error: " + ex.Message + "<br/><br/>Inner Exception: "+ ex.InnerException;

            }

            AttachmentStream.Close();

            return SendOk;

        }

        /// <summary>

        /// 一人一附件发送邮件

        /// 2017-05-17 涂聚文  GeovinDu

        /// </summary>

        /// <param name="To">接收邮件人</param>

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

        /// <param name="Msg">邮件内容</param>

        /// <param name="bodyHtml">是否網頁</param>

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

        /// <returns></returns>

        public static bool SendEmaildu(string To, string Subject, string Msg, bool bodyHtml, string AttachmentFileName)

        {

            MemoryStream AttachmentStream = new MemoryStream();

            bool SendOk = false;

            try

            {

                System.Net.Mail.MailMessage newMsg = new System.Net.Mail.MailMessage(System.Configuration.ConfigurationManager.AppSettings["mailCfg"], To, Subject, Msg);

                newMsg.BodyEncoding = System.Text.Encoding.UTF8;

                newMsg.HeadersEncoding = System.Text.Encoding.UTF8;

                newMsg.SubjectEncoding = System.Text.Encoding.UTF8;

                System.Net.Mail.SmtpClient smtpClient = new System.Net.Mail.SmtpClient();

                //smtpClient.Credentials = new NetworkCredential("geovindu@dusystem.com","888888");

                //smtpClient.Port = 25;

                //smtpClient.EnableSsl = false;

                if (AttachmentStream != null && AttachmentFileName != null)

                {

                    // ADD AN ATTACHMENT.

                    //String sFile = @"C:\Source\LNS_IS.TXT";

                    //MailAttachment oAttch = new MailAttachment(sFile, MailEncoding.Base64);

                    //string filePath = @"C:\TestEmail\SKYPE11月黑咭生日會員.xls";

                    //MemoryStream memStream = new MemoryStream();

                    //using (FileStream fileStream = File.OpenRead(filePath))

                    //{

                    //    memStream.SetLength(fileStream.Length);

                    //    fileStream.Read(memStream.GetBuffer(), 0, (int)fileStream.Length);

                    //}

                    newMsg.Attachments.Add(new Attachment(AttachmentStream, AttachmentFileName)); //MediaTypeNames.Image.Jpeg)                

                    //System.Net.Mail.Attachment attachment = new System.Net.Mail.Attachment(AttachmentStream, AttachmentFileName);

                    //System.Net.Mime.ContentDisposition disposition = attachment.ContentDisposition;

                    //disposition.FileName = AttachmentFileName;

                    //disposition.DispositionType = System.Net.Mime.DispositionTypeNames.Attachment;

                    //newMsg.Attachments.Add(attachment);

                }

                newMsg.IsBodyHtml = bodyHtml;

                smtpClient.Send(newMsg);

                SendOk = true;

                //return SENT_OK;

            }

            catch (Exception ex)

            {

                ex.Message.ToString();

                AttachmentStream.Close();

                SendOk = false;

                //"Error: " + ex.Message + "<br/><br/>Inner Exception: "+ ex.InnerException;

            }

            AttachmentStream.Close();

            return SendOk;

        }

        /// <summary>

        /// 一人多附件发送邮件

        /// 2019-06-18 涂聚文 GeovinDu

        /// </summary>

        /// <param name="To">接收邮件人</param>

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

        /// <param name="Msg">邮件内容</param>

        /// <param name="bodyHtml">是否網頁</param>

        /// <param name="AttachmentFiles">多附件</param>

        /// <returns></returns>

        public static bool SendEmailduFiles(string To, string Subject, string Msg, bool bodyHtml, List<string> AttachmentFiles)

        {

            MemoryStream AttachmentStream = new MemoryStream();

            bool SendOk = false;

            try

            {

                System.Net.Mail.MailMessage newMsg = new System.Net.Mail.MailMessage(System.Configuration.ConfigurationManager.AppSettings["mailCfg"], To, Subject, Msg);

                newMsg.BodyEncoding = System.Text.Encoding.UTF8;

                newMsg.HeadersEncoding = System.Text.Encoding.UTF8;

                newMsg.SubjectEncoding = System.Text.Encoding.UTF8;

                System.Net.Mail.SmtpClient smtpClient = new System.Net.Mail.SmtpClient();

                //smtpClient.Credentials = new NetworkCredential("geovindu@dusystem.com","888888");

                //smtpClient.Port = 25;

                //smtpClient.EnableSsl = false;

                if (AttachmentStream != null && AttachmentFiles != null)

                {

                    foreach (string filename in AttachmentFiles)

                    {

                        newMsg.Attachments.Add(new Attachment(AttachmentStream, filename)); //MediaTypeNames.Image.Jpeg)   

                    }     

                }

                newMsg.IsBodyHtml = bodyHtml;

                smtpClient.Send(newMsg);

                SendOk = true;

            }

            catch (Exception ex)

            {

                ex.Message.ToString();

                AttachmentStream.Close();

                SendOk = false;

            }

            AttachmentStream.Close();

            return SendOk;

        }

        /// <summary>

        /// 多人多附件发送邮件

        /// 不考虑统计每封邮件发送状态（另外考虑完善代码）

        ///  2019-06-18 涂聚文 GeovinDu

        /// </summary>

        /// <param name="Tos">多人接收邮件人</param>

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

        /// <param name="Msg">邮件内容</param>

        /// <param name="bodyHtml">是否網頁</param>

        /// <param name="AttachmentFiles">多附件</param>

        /// <returns></returns>

        public static bool SendEmailsAndFiles(List<string> Tos, string Subject, string Msg, bool bodyHtml, List<string> AttachmentFiles)

        {

            MemoryStream AttachmentStream = new MemoryStream();

            bool SendOk = false;

            List<Attachment> all = new List<Attachment>();

            try

            {

                if (AttachmentStream != null && AttachmentFiles != null)

                {

                    foreach (string filename in AttachmentFiles)

                    {

                        all.Add(new Attachment(AttachmentStream, filename));

                    }

                }

                if (Tos.Count > 0)

                {

                    foreach (string To in Tos)

                    {

                        System.Net.Mail.MailMessage newMsg = new System.Net.Mail.MailMessage(System.Configuration.ConfigurationManager.AppSettings["mailCfg"], To, Subject, Msg);

                        newMsg.BodyEncoding = System.Text.Encoding.UTF8;

                        newMsg.HeadersEncoding = System.Text.Encoding.UTF8;

                        newMsg.SubjectEncoding = System.Text.Encoding.UTF8;

                        System.Net.Mail.SmtpClient smtpClient = new System.Net.Mail.SmtpClient();

                        //smtpClient.Credentials = new NetworkCredential("geovindu@dusystem.com","888888");

                        //smtpClient.Port = 25;

                        //smtpClient.EnableSsl = false;

                        if (AttachmentStream != null && AttachmentFiles != null)

                        {

                            foreach (Attachment attname in all)

                            {

                                newMsg.Attachments.Add(attname); //MediaTypeNames.Image.Jpeg)   

                            }

                        }

                        newMsg.IsBodyHtml = bodyHtml;

                        smtpClient.Send(newMsg);

                        SendOk = true;

                   }

                }

            }

            catch (Exception ex)

            {

                ex.Message.ToString();

                AttachmentStream.Close();

                SendOk = false;

            }

            AttachmentStream.Close();

            return SendOk;

        }

　　测试代码：

            MemoryStream theMemStream = new MemoryStream();

            string file = @"C:\TestEmail\SKYPE11月黑咭生日會員.xls";  //C:\TestEmail\Top1000WorldBanks2014.pdf

            if (File.Exists(file))

            {

                //AttachmentStream = File.Open(file, FileMode.Open, FileAccess.Read);

                byte[] filebyte = MirosoftSmptHelper.ReadFile(file);

                theMemStream.Write(filebyte, 0, filebyte.Length);// = File.OpenRead(file);

                theMemStream.Position = 0;

                //theMemStream.Close();

                // AttachmentStream = theMemStream;// BytesToStream(filebyte); //new MemoryStream(filebyte);// // BytesToStream(filebyte);// FileToStream(file);// 

                //AttachmentStream.CanTimeout =true;

                //AttachmentStream.ReadTimeout = 1000;

                //AttachmentStream.WriteTimeout = 1000;

                //AttachmentStream = BytesToStream(filebyte);

                //theMemStream.Close();

            }

            List<string> AttachmentFiles = new List<string>();

            AttachmentFiles.Add("馬拉松獎牌刻字.xlsx");

            AttachmentFiles.Add("进一步优化供给推动消费平稳增长2019.pdf");

            AttachmentFiles.Add("逃犯条例草案.pdf");

            AttachmentFiles.Add("复习卷14.doc");

            List<string> Tos = new List<string>();

            Tos.Add("geovindu@163.com");

            Tos.Add("geovindu@hotmail.com");

            Tos.Add("geovi@qq.com");

            //1.一人一附件

            //bool issend = MirosoftSmptHelper.SendEmaildu("geovindu@163.com", "中文文件名.net 4.0,geovindu 涂聚文塗聚文工團、", "<p> 生命運浪漫滿屋geovindu江蘇黃河</p><br/><p>上官放個屁，下官一台戲</p>", true,"馬拉松獎牌刻字.xlsx");

            //2.一人多附件

            //bool issend = MirosoftSmptHelper.SendEmailduFiles("geovindu@163.com", "中文文件名.net 4.0,geovindu 涂聚文塗聚文工團、", "<p> 生命運浪漫滿屋geovindu江蘇黃河</p><br/><p>上官放個屁，下官一台戲</p>", true, AttachmentFiles);

           //3.多人多附件

            bool issend = MirosoftSmptHelper.SendEmailsAndFiles(Tos, "中文文件名.net 4.0,geovindu 涂聚文塗聚文工團、", "<p> 生命運浪漫滿屋geovindu江蘇黃河</p><br/><p>上官放個屁，下官一台戲</p>", true, AttachmentFiles);

            theMemStream.Close();

            if (issend)

            {

                MessageBox.Show("ok");

            }

            else

            {

                MessageBox.Show("no");

            }

        }

　　不忘初心，方得始终；初心易得，始终难守。

        /// <summary>

        /// 多人多附件发送邮件

        /// 不考虑统计每封邮件发送状态（另外考虑完善代码）

        ///  2019-06-18 涂聚文 GeovinDu

        ///  2019-07-01

        /// </summary>

        /// <param name="Tos">多人接收邮件人</param>

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

        /// <param name="Msg">邮件内容</param>

        /// <param name="bodyHtml">是否網頁</param>

        /// <param name="AttachmentFiles">多附件--具体文件地址</param>

        /// <returns></returns>

        public static bool SendEmailsAndFiles(List<string> Tos, string Subject, string Msg, bool bodyHtml, List<string> AttachmentFiles)

        {

            MemoryStream AttachmentStream = new MemoryStream();

            bool SendOk = false;

            List<Attachment> all = new List<Attachment>();

            try

            {

                if (AttachmentStream != null && AttachmentFiles != null)

                {

                    foreach (string filename in AttachmentFiles)

                    {

                        Attachment attachment = new Attachment(filename, MediaTypeNames.Application.Octet); // //AttachmentStream, filename

                        ContentDisposition disposition = attachment.ContentDisposition;

                        disposition.CreationDate = File.GetCreationTime(filename);

                        disposition.ModificationDate = File.GetLastWriteTime(filename);

                        disposition.ReadDate = File.GetLastAccessTime(filename);

                        disposition.FileName = Path.GetFileName(filename);

                        disposition.Size = new FileInfo(filename).Length;

                        disposition.DispositionType = DispositionTypeNames.Attachment;

                        all.Add(attachment); //new Attachment(AttachmentStream, filename)

                    }

                }

                if (Tos.Count > 0)

                {

                    foreach (string To in Tos)

                    {

                        System.Net.Mail.MailMessage newMsg = new System.Net.Mail.MailMessage(System.Configuration.ConfigurationManager.AppSettings["mailCfg"], To, Subject, Msg);

                        newMsg.BodyEncoding = System.Text.Encoding.UTF8;

                        newMsg.HeadersEncoding = System.Text.Encoding.UTF8;

                        newMsg.SubjectEncoding = System.Text.Encoding.UTF8;

                        System.Net.Mail.SmtpClient smtpClient = new System.Net.Mail.SmtpClient();

                        //smtpClient.Credentials = new NetworkCredential("geovindu@dusystem.com","888888");

                        //smtpClient.Port = 25;

                        //smtpClient.EnableSsl = false;

                        if (AttachmentStream != null && AttachmentFiles != null)

                        {

                            foreach (Attachment attname in all)

                            {

                                newMsg.Attachments.Add(attname); //MediaTypeNames.Image.Jpeg)   

                            }

                        }

                        newMsg.IsBodyHtml = bodyHtml;

                        smtpClient.Send(newMsg);

                        SendOk = true;

                   }

                }

            }

            catch (Exception ex)

            {

                ex.Message.ToString();

                AttachmentStream.Close();

                SendOk = false;

            }

            AttachmentStream.Close();

            return SendOk;

        }

        /// <summary>

        /// 多人多附件发送邮件

        /// 不考虑统计每封邮件发送状态（另外考虑完善代码）

        ///  2019-07-01 涂聚文 GeovinDu

        /// </summary>

        /// <param name="Tos">多人接收邮件人</param>

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

        /// <param name="Msg">邮件内容</param>

        /// <param name="bodyHtml">是否網頁</param>

        /// <param name="AttachmentFiles">多附件--根据运行程序目录地址</param>

        /// <returns></returns>

        public static bool SendEmailsAndLocalFiles(List<string> Tos, string Subject, string Msg, bool bodyHtml, List<string> AttachmentFiles)

        {

            MemoryStream AttachmentStream = new MemoryStream();

            bool SendOk = false;

            List<Attachment> all = new List<Attachment>();

            try

            {

                if (AttachmentStream != null && AttachmentFiles != null)

                {

                    foreach (string filename in AttachmentFiles)

                    {

                        //具体的文件地址，用此法

                        //Attachment attachment = new Attachment(filename, MediaTypeNames.Application.Octet); // //AttachmentStream, filename

                        //ContentDisposition disposition = attachment.ContentDisposition;

                        //disposition.CreationDate = File.GetCreationTime(filename);

                        //disposition.ModificationDate = File.GetLastWriteTime(filename);

                        //disposition.ReadDate = File.GetLastAccessTime(filename);

                        //disposition.FileName = Path.GetFileName(filename);

                        //disposition.Size = new FileInfo(filename).Length;

                        //disposition.DispositionType = DispositionTypeNames.Attachment;

                        all.Add(new Attachment(AttachmentStream, filename));//在运行程序的目录的文件没有问题，可执行。如是不是此语言件地址，附件无效

                    }

                }

                if (Tos.Count > 0)

                {

                    foreach (string To in Tos)

                    {

                        System.Net.Mail.MailMessage newMsg = new System.Net.Mail.MailMessage(System.Configuration.ConfigurationManager.AppSettings["mailCfg"], To, Subject, Msg);

                        newMsg.BodyEncoding = System.Text.Encoding.UTF8;

                        newMsg.HeadersEncoding = System.Text.Encoding.UTF8;

                        newMsg.SubjectEncoding = System.Text.Encoding.UTF8;

                        System.Net.Mail.SmtpClient smtpClient = new System.Net.Mail.SmtpClient();

                        //smtpClient.Credentials = new NetworkCredential("geovindu@dusystem.com","888888");

                        //smtpClient.Port = 25;

                        //smtpClient.EnableSsl = false;

                        if (AttachmentStream != null && AttachmentFiles != null)

                        {

                            foreach (Attachment attname in all)

                            {

                                newMsg.Attachments.Add(attname); //MediaTypeNames.Image.Jpeg)   

                            }

                        }

                        newMsg.IsBodyHtml = bodyHtml;

                        smtpClient.Send(newMsg);

                        SendOk = true;

                    }

                }

            }

            catch (Exception ex)

            {

                ex.Message.ToString();

                AttachmentStream.Close();

                SendOk = false;

            }

            AttachmentStream.Close();

            return SendOk;

        }

      /// <summary>

        /// 20190702 多人邮件

        /// geovindu 涂聚文

        /// </summary>

        /// <param name="Mails"></param>

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

        /// <param name="Msg"></param>

        /// <param name="bodyHtml"></param>

        /// <param name="AttachmentFiles"></param>

        /// <returns></returns>

        public static bool SendEmailsFiles(List<MailAddress> Mails, string Subject, string Msg, bool bodyHtml, List<string> AttachmentFiles)

        {

            MemoryStream AttachmentStream = new MemoryStream();

            bool SendOk = false;

            List<Attachment> all = new List<Attachment>();

            try

            {

                if (AttachmentStream != null && AttachmentFiles != null)

                {

                    foreach (string filename in AttachmentFiles)

                    {

                        //具体的文件地址，用此法

                        Attachment attachment = new Attachment(filename, MediaTypeNames.Application.Octet); // //AttachmentStream, filename

                        ContentDisposition disposition = attachment.ContentDisposition;

                        disposition.CreationDate = File.GetCreationTime(filename);

                        disposition.ModificationDate = File.GetLastWriteTime(filename);

                        disposition.ReadDate = File.GetLastAccessTime(filename);

                        disposition.FileName = Path.GetFileName(filename);

                        disposition.Size = new FileInfo(filename).Length;

                        disposition.DispositionType = DispositionTypeNames.Attachment;

                        all.Add(attachment);//在运行程序的目录的文件没有问题，可执行。如是不是此语言件地址，附件无效

                    }

                }

                if (Mails.Count > 0)

                {

                    int c = 1;

                    foreach (MailAddress ToAddress in Mails)

                    {

                        MailAddress from=new MailAddress(System.Configuration.ConfigurationManager.AppSettings["mailCfg"],System.Configuration.ConfigurationManager.AppSettings["displayName"]);

                        //from.DisplayName="";

                       // from.Address=;

                        System.Net.Mail.MailMessage newMsg = new System.Net.Mail.MailMessage();

                        newMsg.From = from;

                        newMsg.To.Add(ToAddress);

                        newMsg.Subject = Subject;

                        newMsg.Body = Msg;

                        newMsg.BodyEncoding = System.Text.Encoding.UTF8;

                        newMsg.HeadersEncoding = System.Text.Encoding.UTF8;

                        newMsg.SubjectEncoding = System.Text.Encoding.UTF8;

                        System.Net.Mail.SmtpClient smtpClient = new System.Net.Mail.SmtpClient();

                        //smtpClient.Credentials = new NetworkCredential("geovindu@dusystem.com","888888");

                        //smtpClient.Port = 25;

                        //smtpClient.EnableSsl = false;

                        if (AttachmentStream != null && AttachmentFiles != null)

                        {

                            foreach (Attachment attname in all)

                            {

                                newMsg.Attachments.Add(attname); //MediaTypeNames.Image.Jpeg)

                            }

                        }

                        newMsg.IsBodyHtml = bodyHtml;

                        //smtpClient.Send(newMsg);

                        smtpClient.SendCompleted += new SendCompletedEventHandler(SendCompletedCallback);

                        string userState = "test message:"+c.ToString();

                        smtpClient.SendAsync(newMsg, userState);

                        SendOk = true;

                        c++;

                    }

                }

            }

            catch (Exception ex)

            {

                ex.Message.ToString();

                AttachmentStream.Close();

                SendOk = false;

            }

            AttachmentStream.Close();

            return SendOk;

        }

        /// <summary>

        /// 一人多附件

        /// </summary>

        /// <param name="Mails"></param>

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

        /// <param name="Msg"></param>

        /// <param name="bodyHtml"></param>

        /// <param name="AttachmentFiles"></param>

        /// <returns></returns>

        public static bool SendEmailFiles(MailAddress Mails, string Subject, string Msg, bool bodyHtml, List<string> AttachmentFiles)

        {

            MemoryStream AttachmentStream = new MemoryStream();

            bool SendOk = false;

            List<Attachment> all = new List<Attachment>();

            try

            {

                if (AttachmentStream != null && AttachmentFiles != null)

                {

                    foreach (string filename in AttachmentFiles)

                    {

                        //具体的文件地址，用此法

                        Attachment attachment = new Attachment(filename, MediaTypeNames.Application.Octet); // //AttachmentStream, filename

                        ContentDisposition disposition = attachment.ContentDisposition;

                        disposition.CreationDate = File.GetCreationTime(filename);

                        disposition.ModificationDate = File.GetLastWriteTime(filename);

                        disposition.ReadDate = File.GetLastAccessTime(filename);

                        disposition.FileName = Path.GetFileName(filename);

                        disposition.Size = new FileInfo(filename).Length;

                        disposition.DispositionType = DispositionTypeNames.Attachment;

                        all.Add(attachment);//在运行程序的目录的文件没有问题，可执行。如是不是此语言件地址，附件无效

                    }

                } 

                    MailAddress from = new MailAddress(System.Configuration.ConfigurationManager.AppSettings["mailCfg"], System.Configuration.ConfigurationManager.AppSettings["displayName"]);

                    //from.DisplayName="";

                    // from.Address=;

                    System.Net.Mail.MailMessage newMsg = new System.Net.Mail.MailMessage();

                    newMsg.From = from;

                    newMsg.To.Add(Mails);

                    newMsg.Subject = Subject;

                    newMsg.Body = Msg;

                    newMsg.BodyEncoding = System.Text.Encoding.UTF8;

                    newMsg.HeadersEncoding = System.Text.Encoding.UTF8;

                    newMsg.SubjectEncoding = System.Text.Encoding.UTF8;

                    System.Net.Mail.SmtpClient smtpClient = new System.Net.Mail.SmtpClient();

                    //smtpClient.Credentials = new NetworkCredential("geovindu@dusystem.com","888888");

                    //smtpClient.Port = 25;

                    //smtpClient.EnableSsl = false;

                    if (AttachmentStream != null && AttachmentFiles != null)

                    {

                        foreach (Attachment attname in all)

                        {

                            newMsg.Attachments.Add(attname); //MediaTypeNames.Image.Jpeg)

                        }

                    }

                    newMsg.IsBodyHtml = bodyHtml;

                    //smtpClient.Send(newMsg);

                    smtpClient.SendCompleted += new SendCompletedEventHandler(SendCompletedCallback);

                    string userState = "test message:发送中";

                    smtpClient.SendAsync(newMsg, userState);

                    SendOk = true;                       

            }

            catch (Exception ex)

            {

                ex.Message.ToString();

                AttachmentStream.Close();

                SendOk = false;

            }

            AttachmentStream.Close();

            return SendOk;

        }

　　测试

  List<MailAddress> mails = new List<MailAddress>();

            MailAddress address = null;

            address = new MailAddress("geovindu@163.com", "涂聚文", Encoding.UTF8);

            mails.Add(address);

            address = new MailAddress("geovindu@hotmail.com", "塗聚文", Encoding.UTF8);

            mails.Add(address);

            address = new MailAddress("463588883@qq.com", "捷為工作室", Encoding.UTF8);

            mails.Add(address);

            string strMessage = string.Empty;

            string subject = string.Empty;

            subject=txtSubject.Text.Trim();

            strMessage = htmlEditUserControl1.HtmlEditControl.DocumentText;

            //1.一人一附件

            //bool issend = MirosoftSmptHelper.SendEmaildu("geovindu@163.com", "中文文件名.net 4.0,geovindu 涂聚文塗聚文工團、", "<p> 生命運浪漫滿屋geovindu江蘇黃河</p><br/><p>上官放個屁，下官一台戲</p>", true,"馬拉松獎牌刻字.xlsx");

            //2.一人多附件

            //bool issend = MirosoftSmptHelper.SendEmailduFiles("geovindu@163.com", "中文文件名.net 4.0,geovindu 涂聚文塗聚文工團、", "<p> 生命運浪漫滿屋geovindu江蘇黃河</p><br/><p>上官放個屁，下官一台戲</p>", true, AttachmentFiles);

           //3.多人多附件

            //bool issend = MirosoftSmptHelper.SendEmailsAndFiles(Tos, subject, strMessage, true, AttachmentFiles);

            bool issend = MirosoftSmptHelper.SendEmailsFiles(mails, subject, strMessage, true, AttachmentFiles);

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