[Mimedefang] action_drop_with_warning with recipient depending message

[Richard Laager]

You have to understand that MIMEDefang is operating on one message. It
may have multiple recipients, but anything you do happens to that message.

If you want different per-recipient behavior for the same message,
somewhere along the line you need to resend the message. You can do this
up-front all the time with stream_by_recipient() or you can do it as
needed with resend_message().

-- 
Richard