Send email upto 2000

MailMessage mail = new MailMessage();
                   mail.To.Add(ToEmail);
                   mail.From = new MailAddress(fromEmail);
                   mail.Subject = "Subject";
                   string Body = "Email Body Message;
                   mail.Body = Body;
                   mail.IsBodyHtml = true;
                   SmtpClient smtp = new SmtpClient();
                   smtp.Host = "smtp from Hosting";
                   smtp.Port = 25;
                   smtp.UseDefaultCredentials = false;
                   smtp.Credentials = new System.Net.NetworkCredential("email", "password");// Enter seders User name and password
                   //smtp.EnableSsl = true;
                   smtp.Send(mail);