Problem sending attachment to MMS

[DanHamilton]

I have a simple form that sends email with attachment (small gif, about 5k) through smtp.gmail.com to a cellphone MMS address (9999999999@mms.att.net).

If I log in to Gmail and send the message and attachment manually, it comes through fine. But if I send the message and attachment from my program, the phone receives the message but not the attachment. The message in cludes a statement: "One or more of the message components have been deleted by MMS Adaptation. Either the message was too large or the components were unsuitable for your terminal."

Any idea what might be different about the attachment sent from Gmail and the one I send? The same file was used in both cases.

Here's the code...

[FONT="Courier New"]    Private Sub btnSend_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSend.Click
        Dim Message As New MailMessage
        Dim AttachmentFile As System.Net.Mail.Attachment
        Dim Client As New SmtpClient("smtp.gmail.com")
        Try
            Message.From = New MailAddress(txtFrom.Text)
            Message.To.Add(New MailAddress(txtTo.Text))
            Message.Subject = txtSubject.Text
            Message.Body = txtBody.Text
            Message.IsBodyHtml = True
            If File.Exists(txtAttachment.Text) Then
                AttachmentFile = New Attachment(txtAttachment.Text)
                Message.Attachments.Add(AttachmentFile)
            Else
                MsgBox("Attachment file not found")
                Exit Sub
            End If

            Client.Port = 587
            Client.EnableSsl = True
            Client.Credentials = New System.Net.NetworkCredential("mygmailaccount@gmail.com", "mygmailpassword")
            Client.Send(Message)
            MsgBox("Message sent")

        Catch ex As Exception
            MsgBox(ex.Message)
        End Try

    End Sub[/FONT]