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The following code was working correctly for over a year. Upgraded to new .net framework and smtpclient.send no longer works and throws an exception. here is the test code:

    Protected Sub Submit_Click(sender As Object, e As System.EventArgs)

        Dim mailMessage As System.Net.Mail.MailMessage = New System.Net.Mail.MailMessage()

        mailMessage.From = New       System.Net.Mail.MailAddress(System.Configuration.ConfigurationManager.AppSettings("fromEmail"))

        mailMessage.To.Add(System.Configuration.ConfigurationManager.AppSettings("toEmail"))

        mailMessage.Subject = System.Configuration.ConfigurationManager.AppSettings("EmailSubject")

        mailMessage.Body = mailMessage.Body & "Food Lot Tracking" & Environment.NewLine

        mailMessage.IsBodyHtml = False

        Dim smtpClient As System.Net.Mail.SmtpClient = New System.Net.Mail.SmtpClient()

        Try

            smtpClient.Send(mailMessage)

        Catch ex As Exception

            Server.Transfer("RegisterBadEmail.aspx")

        Finally

        End Try

        Server.Transfer("RegisterOK.aspx")

    End Sub

Thanks in advance for your help.

JR

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