C# - Sending Email Using Gmail Account On Local Machine

I am using gmail for sending email in my asp.net application. Email works fine if I send email on server but if I try to send emails on local machine it give error. I placed break poin in code and when send method is called it shows error box with heading "Smtp exception was unhandled by user code" and in detail it says "Faliur sending mail". If I continued on browser it shows error page with these details:

An existing connection was forcibly closed by the remote host Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.Net.Sockets.SocketException: An existing connection was forcibly closed by the remote host

protected void btnConfirm_Click(object sender, EventArgs e)
{
string _Message = GetAdminEmailMessage();
MailMessage message = new MailMessage();
SmtpClient smtp = new SmtpClient();
NetworkCredential mailAuthentication = new NetworkCredential("myaccount@gmail.com", "mypassword");
message.To.Add(new MailAddress("mc5678@hotmail.com"));
message.From = new MailAddress("myaccount@gmail.com");
message.IsBodyHtml = true;
message.Subject = "Local test email";
message.Body = _Message;
smtp.UseDefaultCredentials = false;
smtp.EnableSsl = true;
smtp.Port = 587;
smtp.DeliveryMethod = SmtpDeliveryMethod.Network;
smtp.Host = "smtp.gmail.com";
smtp.Credentials = mailAuthentication;
smtp.Send(message);
}