[Mimedefang] How do I remove infected attachments before bouncing mail (action_bounce)

[George Kuetemeyer]

We're currently bouncing/rejecting infected mail using action_bounce. This
routine appears to send the entire message, including the virus-infected
attachment, back to the sender - which doesn't seem like a good thing to do.
Is there any way to remove infected parts before bouncing the message? We
tried using action_drop_with_warning, but this doesn't appear to modify the
message that gets bounced. Here's a listing of what we tried (within the
filter routine):

        my ($code, $category, $action) = entity_contains_virus($entity);
        if ($category eq "virus") {
            md_log('virus',$VirusName, $RelayAddr);

            # Remove offending part
            action_drop_with_warning("$VirusName infected part removed");

            # Bounce the mail!
            action_bounce("Virus $VirusName found in mail - rejected");

Actually, what we would really like to do is send back a warning notice and
simply discard infected messages. Has anyone developed code to do that? (Might
as well ask before doing my own coding).

Thanks in advance.

GK