Try

                smtp.Credentials = New _

Net.NetworkCredential(“PM-T-outbound-01zXrTjgz8ghZBEeryvVNJ”, “uX6wpZ_AVDc6SgElNAg7F7so5WxrtsLtDoc4”)

                smtp.Port = 587

                smtp.Host = “smtp.postmarkapp.com”

                If (fileUpload1.HasFile) Then

                        mail.Attachments.Add(New Attachment(fileUpload1.PostedFile.InputStream, fileUpload1.FileName))

                        smtp.Send(mail)

                        Response.Redirect(“thanks.aspx”)

                End If

        Catch ehttp As System.Web.HttpException

                Response.Redirect(“error.aspx”)

        End Try