[Zope] Send Attachment with sendmail - ERROR read

[Vid B]

I am trying to send e-mail with attachment using
following:

<dtml-sendmail mailhost="MailHost">
To:<dtml-var to_email>
From:<dtml-var email_address>
Reply-To:<dtml-var email_address>
Subject:<dtml-var subject>

<dtml-mime type=text/plain encode=7bit>
<dtml-boundary type=application/octet-stream
disposition=attachment encode=base64>
 <dtml-with images>
  <dtml-var
expr="restrictedTraverse(selected_image).read()">
 </dtml-with>
</dtml-mime>

</dtml-sendmail> 

but I am getting error:
 Error Type: AttributeError
        Error Value: read

Can anyone help?

Vid

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