[Exim] Unqualified address in header

I see a fair amount of spam that looks like this:

  Envelope-from: <jennifer_carson@???>
  Envelope-to: <xxx@???>
  Received: from dsl-210-15-193-67.launceston.netspace.net.au ([210.15.193.67] helo=lycos.com)
        by mail.python.org with smtp (Exim 4.05)
        id 17reKv-0003co-00
        for xxx@???; Wed, 18 Sep 2002 08:53:46 -0400
  Reply-To: <jennifer_carson@???>
  Message-ID: <030c24c33b8d$3867b8d2$5ed77ee6@dxgset>
  From: <jennifer_carson@???>
  To: patient
  Subject: Canadian pharmacies will save you more money...
  Date: Wed, 18 Sep 2002 17:52:55 -0500
  MiME-Version: 1.0
  Content-Type: text/plain;
        charset="us-ascii"
  Content-Transfer-Encoding: 8bit
  X-Priority: 3 (Normal)
  X-MSMail-Priority: Normal
  X-Mailer: Microsoft Outlook, Build 10.0.2627

Note the unqualified "To" address. I have header sender verification
and header syntax verification both turned on ... but this message
doesn't violate the conditions that either of those look for.

Is there any way to detect and reject such messages? Or will I have to
code up something in local_scan()?

        Greg
--
Greg Ward <gward@???>                         http://www.gerg.ca/
Heisenberg may have slept here.