Unable to send to all recipients.

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ASP.NET

Hi ,

StringBuilder sb=new BAL.PageContent().EmailList();
                           string s = sb.ToString().Trim().TrimEnd(',');
                           
                            MailAddress fromAddress = new MailAddress("info@captorsolutions.com");
                            message.From = fromAddress;//here you can set address
                            message.To.Add(s);
                            message.Subject = "Feedback";//subject of email
                           // message.CC.Add("cc@site.com");//ccing the same email to other email address
                            //message.Bcc.Add(new MailAddress("bcc@site.com"));//here you can add bcc address
                            message.IsBodyHtml = false;//To determine email body is html or not
                            message.Body = ucEditor1.Content;
                            smtpClient.Send(message);

I am getting an exception "Unable to send to all recipients."

Is there any problem with the code? else the problem with smtp settings

Please help me..

Thanking you all.