Web Forms :: Sending Email - User Code Transaction Failed

i am trying to send a email with the info supplied from my form. i have got the code from a book im going through ( asp.net 3.5 in c# and vb ). First here is the code behind from the submit button:

Protected Sub btn_submit_Click(ByVal sender As Object, ByVal e As System.EventArgs)
Dim fileName As String = Server.MapPath("~/App_Data/ContactForm.txt")
Dim mailBody As String = System.IO.File.ReadAllText(fileName)
mailBody = mailBody.Replace("##Name##", tb_firstName.Text)
mailBody = mailBody.Replace("##Surname##", tb_surname.Text)
mailBody = mailBody.Replace("##eMail##", tb_eMail.Text)
mailBody = mailBody.Replace("##Subject##", tb_subject.Text)
mailBody = mailBody.Replace("##Description##", tb_description.Text)
Dim myMessage As MailMessage = New MailMessage()
myMessage.Subject = "##Subject##"
myMessage.Body = mailBody
myMessage.From = New MailAddress("jay@jwwebdesign.net", "##Name##")
myMessage.To.Add(New MailAddress("jay@jwwebdesign.net", "Me"))
Dim mySmtpClient As SmtpClient = New SmtpClient()
mySmtpClient.Send(myMessage)
End Sub

and here is the code from the web.config:

<system.net>
<mailSettings>
<smtp deliveryMethod ="Network" from ="Jay <[URL]>">
<network host ="smtp.jwwebdesign.net" />
</smtp>
</mailSettings>
</system.net>

when in debug mode it points the error to being:

smtp exeption was unhandled by user code Transaction failed. The server response was: m1pismtp01-001.prod.mesa1.secureserver.net and it highlights this code:.........