[exim] Exim exiscan ACL woes

Hi Guys

I upgraded to from Exim 4.20 to Exim 4.43 with Exiscan patch and the ACL
below broke:

This is the acl:
----------------

  # Attachments filtering on per user basis
  deny  message   = User is unable to receive attachments
        condition =
${lookup{$recipients}lsearch{/etc/mail/extensions}{1}{0}}
        !senders  = *@localdomain.com
        demime    = *

Contents of etc/mail/extensions:
------------------------

user

This is the error I get in Exim's mainlog:
------------------------------------------

2005-03-16 09:24:20 1DBSt7-0001Gh-Az H=mail.server.com [xxx.xxx.xxx.xxx]
F=<user@???> temporarily rejected during MIME ACL checks: cannot
test demime condition in MIME ACL


Any help would be great.

c