How To send bulk email (like 500-1000 emails at a time) using asp.net c#

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I have developed a program that sends 70-80 emails but when i enter more email ids (like 500+) then program show time out error.
can any one please solve this problem.
we have to use TO,Cc,BCc,Subject and then Message in HTML Format. All these are entered manually by the user, not from the database.I send emails using SMTP server, I've my own SMTP server.

Posted 11-Dec-14 4:18am

Er.D.K.Malhotra

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AnvilRanger 11-Dec-14 10:59am

Care to share your code, logging, or error messages you are getting? We cannot help you without seeing what you are doing.

If a small batch of emails are being sent correctly you might now be releasing object from memory and with the higher number of emails you are running out.

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DamithSL · Answer 1 · 2014-12-11T06:22:00

check this tutorial: Send Bulk (Mass) Email in ASP.Net using C# and VB.Net[^]
it sends emails using parallel multi threading.
sample code:

C#

Parallel.ForEach(dtCustomers.AsEnumerable(), row =>
    {
        SendEmail(row["Email"].ToString(), subject, string.Format(body, row["Name"]));
    });

method:

private bool SendEmail(string recipient, string subject, string body)
{
   bool isSuccess =false;
   try{
    MailMessage mm = new MailMessage("sender@gmail.com", recipient);
    mm.Subject = subject;
    mm.Body = body;
    mm.IsBodyHtml = true;
    SmtpClient smtp = new SmtpClient();
    smtp.Host = "smtp.gmail.com";
    smtp.EnableSsl = true;
    NetworkCredential NetworkCred = new NetworkCredential();
    NetworkCred.UserName = "sender@gmail.com";
    NetworkCred.Password = "<password>";
    smtp.UseDefaultCredentials = true;
    smtp.Credentials = NetworkCred;
    smtp.Port = 587;
    smtp.Send(mm);
    isSuccess =true;
    }catch(Exception ex)
    {
       // log the exception 
       
    }
    return isSuccess ; 
}