Sending Multiple mail in a queue

Sending Multiple mail in a queue in asp.net:

 string strTo = txtTo.Text;
        for (int i = 0; i < strTo.Split(',').Length;i++ )
        {
             string strMailId = strTo.Split(',')[i];
             try
            {
                MailMessage msg = new MailMessage();
                msg.From = txtFrom;
                msg.To=txtTo;
                msg.Subject = txtSubject.Text;
                msg.IsBodyHtml = true;
                msg.Body = txtMail.Text;
                msg.Priority = MailPriority.High;

                System.Net.Mail.SmtpClient client = new System.Net.Mail.SmtpClient("smtp.gmail.com", 25);
                client.UseDefaultCredentials = false;
                client.Credentials = new System.Net.NetworkCredential("xxx@gmail.com", "xxx"); //Email and Password

                client.EnableSsl = true;

                client.Send(msg );
           
                ScriptManager.RegisterStartupScript(btnSend, typeof(Page), "Confirm", "alert('Your enquiry sent successfully!');formReset();", true);
            }
            catch (Exception Ex)
            {
                ScriptManager.RegisterStartupScript(btnSend, typeof(Page), "Error:", "alert('Oops! Some error occoured.')", true);
            }
        }