SMTP email from C#

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254

/// <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：

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49

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。

 

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145

/// <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; }

　　

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156

/// <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

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21

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);