c# - SmtpException While sending mails in a bulk of 3 or more -


i using smtpclient send emails.i using same code last 2years,but last day when send 3 or more emails 1 of them fail.when sent failed 1 again sent out.please me using aibn.com mail server.

 public bool sendmail(string p_strfrom, string p_strdisplayname, string p_strto, string p_strsubject, string p_strmessage , string strfilename)      {          try          {              p_strdisplayname = _displayname;              string smtpserver = _smtpserver;              smtpclient smtpclient = new smtpclient();              mailmessage message = new mailmessage();              mailaddress fromaddress = new mailaddress(_from,_displayname);              smtpclient.host = _smtpserver;              smtpclient.port = convert.toint32(_port);              string strauth_username = _username;              string strauth_password = _password;              if (strauth_username != null)              {                  system.net.networkcredential smtpuserinfo = new system.net.networkcredential(strauth_username, strauth_password);                  smtpclient.usedefaultcredentials = false;                  if (_ssl)                  {                      smtpclient.enablessl = true;                  }                  smtpclient.credentials = smtpuserinfo;              }              message.from = fromaddress;               message.subject = p_strsubject;              message.isbodyhtml = true;              message.body = p_strmessage;              message.to.add(p_strto);              try              {                  smtpclient.send(message);                  log.writespeciallog("smtpclient mail sending first try success", "");              }               catch (exception ee)              {                  log.writespeciallog("smtpclient mail sending first try failed : " + ee.tostring(), "");                  return false;              }              return true;          }          catch (exception ex)          {              log.writelog("smtpclient mail sending overall failed : " + ex.tostring());                return false;          }      }

got following error message

smtpclient mail sending failed :          system.net.mail.smtpexception:                           failure sending mail.         system.nullreferenceexception:                           object reference not set instance of object.        @ system.net.mail.smtpconnection.getconnection(string host, int32 port)        @ system.net.mail.smtpclient.send(mailmessage message)        --- end of inner exception stack trace ---        @ system.net.mail.smtpclient.send(mailmessage message)

i have changed mail server , working fine.may depends mail service restriction prevent flooding and/or spam.


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