.net - smtpclient.sendasync fails to work with too many recipients -

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this application wpf windows application using c#,

i trying send email long list of recipients. let me state @ outset not spam these people have signed list.

i using smtpclient.sendasync. works fine in testing when send 1 3 people when send whole mailing list, fails work. number on list 2623. there no error message; it’s receipts don’t email. problem debug because can’t test by, example, sending 100 people because spamming.

see code below. note changed email addresses prevent spamming. 

int32 _messagecount = 0;             mailmessage msg = new mailmessage();             smtpclient client = new smtpclient(configuration.smtpserver);             string _prioremail = "";              msg.from = new mailaddress("a@b.com");             msg.to.add (new mailaddress("a@b.com"));              // bcc list              foreach (string str in emailtoaddresses)             {                 if (clsutilities.isanemail(str) == true && str != _prioremail)                 {  // process valid emails , avoid dups                     _messagecount += 1;                       msg.bcc.add(new mailaddress(str));                     _prioremail = str;                 }              }              msg.subject = emailsubject;             msg.isbodyhtml = true;             msg.body = emailbodyhtml;              client.sendasync(msg,null);

the limitation comes smtp server itself: set-up prevent sending emails huge amount of recipients, various reasons (from legal through business performance).

check provider of smtp server actual limitation. work around throttling operation, and/or using smtp server allows greater number of recipients.

see this iis documentation example: states if limit 100, , recipients list 105 addresses long, first 100 addresses processed.


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