[exim] acl_non_smtp and the -t option

I want to do some checking on messages being injected by web pages using the -t
command-line option. As far as I can see I will need to use a acl_non_smtp ACL.

With the -t option Exim will take the recipients from the header. I would like
to restrict recipients to a limited set of local users under these
circumstances, but I don't see how I can do it. With SMTP one gets to use an
ACL for each recipient, but you only get one go at acl_non_smtp. I thought of
$recipients, but it will not contain anything in this situation.

Any suggestions please?

Phil.
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Phil Chambers (postmaster@???)
University of Exeter