BCC mail is not going - all other in the code like subject & to addresses are working fine

protected void SendEmail(string MemberName, string EmailId)
        {
            string TextMessage = TBMessage.Text;
            string ClubName = TBClubName.Text;
            string HtmlTemplate = Server.MapPath("EmailTemplates/PromoteMembers.html");
            string content;
            string senderID = "promote@example.com";
            const string senderPassword = "p@ssw0rd";             
            using (var strReader = new StreamReader(HtmlTemplate))
            {
                content = strReader.ReadToEnd();
            }
            using (StringWriter sw = new StringWriter())
            {
                using (HtmlTextWriter hw = new HtmlTextWriter(sw))
                {                                        
                    content = content.Replace("<%Name%>", MemberName);
                    content = content.Replace("<%Message%>", TextMessage);                    
                }
            }
            string HtmlBody = content;
            AlternateView alternateView = AlternateView.CreateAlternateViewFromString(HtmlBody, null, "text/html");                       
            MailMessage m = new MailMessage();
            m.AlternateViews.Add(alternateView);
            m.From = new MailAddress(senderID, "example.com");
            m.To.Add(new MailAddress(EmailId, MemberName));
            m.Subject = "Message from " + ClubName;
            MailAddress bcc = new MailAddress("example@gmail.com");
            m.Bcc.Add(bcc);
            SmtpClient smtp = new SmtpClient
            {
                Host = "mail.example.com",
                 Port = 8889,
                EnableSsl = false,
                DeliveryMethod = SmtpDeliveryMethod.Network,
                Credentials = new System.Net.NetworkCredential(senderID, senderPassword),
                Timeout = 3000000,
            };            
            smtp.Send(m);
        }

MailAddress bcc = new MailAddress("example@gmail.com");
            m.Bcc.Add(bcc);