Simple Internet mail Configuration.

Hi,
I am got the following code to send a email to the customers visit our site.
But it is not working giving a error as " System.Web.HttpException: The server rejected one or more recipient addresses".
Please help me for the betterment of the code asasp.

        Dim objEmail As New MailMessage
        objEmail.From = "[email protected]"
        objEmail.To = "[email protected]"
        objEmail.Cc = "[email protected]"
        objEmail.Subject = "On Line Booking"
        objEmail.Body = str
        objEmail.Priority = MailPriority.High
        Try
            SmtpMail.SmtpServer = "mail.smtpserverexample.com"
            SmtpMail.Send(objEmail)
            lbl_statusmessage.Text = "Thank you for submitting your interest!
Our representative will contact you shortly."

        Catch exc As Exception
            Response.Write("Mail Sending failure: " + exc.ToString())
        End Try


Thanks
Maheshwaran