Could not access 'CDO.Message' object while using SMTP in System.Web.Mail

Could not access 'CDO.Message' object:

1. The SMTP server must accept your outcoming email address
2. The SMTP server uses the standard port 25 for SMTP

MailMessage Message = new MailMessage();

Message.To = "joe@xxx.com";
Message.From = "xxx@sympatico.ca"; // This address must have been registered in the SMTP server you are using in SmtpMail.SmtpServer
Message.Subject = "Test";
Message.Body = "It is a testing message";

SmtpMail.SmtpServer = "smtp8.sympatico.ca"; // The SMTP server

SmtpMail.Send(Message);