[Exim] Virus scanning without patching Exim

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Author: Juan Carlos Castro y Castro
Date:  
To: exim-users
Subject: [Exim] Virus scanning without patching Exim
Hello, I'm new to this list and the author of this software: OdeiaVir
(http://virus.isverybad.com/) -- a virus scanner plugin originally
written for qmail that, in its latest version, also works with Exim.

Unlike exiscan, it works as a transport filter, so you don't have to
have a patched Exim. When a message is deemed infected, I pipe out a
warning message instead of the original message.

Now, the only limitation is I can't disable the warning message for the
recipient. Under qmail, I could (since processing of a .qmail file
doesn't rely on an external command's output). If I return a value
different than zero, the message gets frozen instead of discarded.

Is there any way I can quietly discard a message at this stage without
radically changing OdeiaVir's operation?