Sending email notification to a group users

Hi Team

I need some help, i have a logic that attempts to send email notification to group user, so far its not working and need help.

public static class EmailNotificationToUser
{
    public static void SendEmail(string htmlString,string emailGrp)
    {
        try
        {
            MailMessage message = new MailMessage();
            SmtpClient smtp = new SmtpClient();
            message.From = new MailAddress("[email protected]");
            List addresses = new List();
            emailGrp += "[email protected]";
            emailGrp.Split(',').Select(i => new MailAddress(i)).ToArray();
            message.To.Add(emailGrp);
            message.Subject = "ShopFloor AMS Incident Report";
            message.IsBodyHtml = true;
            message.Body = htmlString;
            smtp.Port = 587;
            smtp.Host = "smtp.gmail.com";
            smtp.EnableSsl = true;
            smtp.UseDefaultCredentials = false;
            smtp.Credentials = new NetworkCredential("[email protected]", "Telkom800@@");
            smtp.DeliveryMethod = SmtpDeliveryMethod.Network;
            smtp.Send(message);

        }catch(Exception ex)
        {

        }
    }
}