c# - how to handle system.net.mail.smtpfailedrecipientsexception failed recipients -

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i wanna send email multiple addresses (more 1000 users) , use following code, when use send email less 100 users works, more 100 users not work , throw smtpfailedrecipientsexception failed recipients! why? how can send email valid addresses , ride of error?

public void sendmailmessage (string[] to,string message,string subject)      {         mailmessage mmailmessage = new mailmessage ();         int lenght = to.getlength(0);         if (lenght > 1) {             foreach (string email in to) {                 mmailmessage.bcc.add ( email );             }         }         else {             mmailmessage.to.add ( to[0] );         }                  mmailmessage.from = new mailaddress ("no-replay@mycompany.net");                                   smtpclient msmtpclient = new smtpclient ();                 mmailmessage.body = message;                 mmailmessage.isbodyhtml = true;                 mmailmessage.priority = mailpriority.normal;                 mmailmessage.subject = subject;                 msmtpclient.enablessl = true;                                 servicepointmanager.servercertificatevalidationcallback = delegate(object s,x509certificate certificate,x509chain chain, sslpolicyerrors sslpolicyerrors) {return true;};                                 try {                   msmtpclient.send (mmailmessage);                         }         catch (smtpfailedrecipientsexception ex){             (int = 0; < ex.innerexceptions.length; i++)             {                 smtpstatuscode status = ex.innerexceptions[i].statuscode;                 if (status == smtpstatuscode.mailboxbusy ||                     status == smtpstatuscode.mailboxunavailable)                 {                     logger.debug("delivery failed - retrying in 5 seconds.");                     system.threading.thread.sleep(5000);                     //client.send(message);                     msmtpclient.send (mmailmessage);                  }                 else                 {                     logger.debug (string.format ("failed deliver message {0},{1}", ex.innerexceptions[i].failedrecipient, i));                  }              }         }         catch (exception ex)         {             logger.debug (string.format("exception caught in retryifbusy(): {0}", ex.tostring() ));         }      }

looks smtp server using rejecting mails have more 100 recepients.

you can:

  • use distribution lists instead of sending message each recipient directly
  • send multiple messages no more 100 recipients
  • talk admin of server change limit

but aware, when sending messages hundred of external recipients, spam filters flag them spam.


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