Problem In sending Bulk Mail

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Hello everyone
I am trying to send bulk of mails but i only receive 500 mails not matter how many mails i send.I am sending mails in loop.Here is a sample.

C#

 foreach (EmailInfo data in emaildata.ToArray())
        {
            
           
            
                SmtpClient smtpClient = new SmtpClient();
                MailMessage mailMsg = new MailMessage();
                /////////other stuff for mail here///////
                smtpClient.Send(mailMsg);
                
                smtpClient.Dispose();

}

I am using .net framework 4.0.
I get this exception after 500 mails are sent

"Service not available, closing transmission channel. The server response was: too many connections"
Please help
Thanks.

Posted 15-Jul-12 19:37pm

MairajAhmed

Updated 15-Jul-12 19:39pm

v2

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[no name] 16-Jul-12 10:25am

It's more likely that your mail server is shutting it down unless you implemented your own mail server.

3 solutions

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This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

barneyman · Answer 1 · 2012-07-15T19:44:00

Solution 1

I'm guessing TCP sockets are lingering ...

Why don't you instantiate one smtpClient outside the loop, and reuse it inside the loop?

Posted 15-Jul-12 19:44pm

barneyman

Sandeep Mewara · Answer 2 · 2012-07-16T04:37:00

For sending bulk emails, there is a process for queuing and a separate process for sending. This leads to issues with large number of recipients. Suggestion would be to use Windows service or an external service to do it rather than ASP.NET.

Following sample can be of help: Simple Windows Service which sends auto Email alerts[^]

Couple of discussion threads here sums up all:
http://stackoverflow.com/questions/3750485/bulk-mailing-using-smtp-server-in-asp-net[^]
http://stackoverflow.com/questions/1198008/send-mass-emails-with-asp-net[^]

rizwan muhammed khan gouri · Answer 3 · 2012-07-16T20:20:00

this code is folly tested and used in live environment ;

MailMessage mailObj = new MailMessage();
         SmtpClient clientObj = new SmtpClient();

C#

foreach (EmailInfo data in emaildata.ToArray())
       {// write some code here

clientObj.Send(
mailObj);


}
i hope this code will solve your problem if not please comments.

Problem In sending Bulk Mail

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Problem In sending Bulk Mail

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