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4.33 How remote admins can see if an address is a subscriber or not

For the list ‘aaa@example.com’, and subscriber ‘user@host.cn’ send a message to ‘aaa-query=host.cn@example.com’. Users can do this as well, but in that case the reply is sent to the target address (‘user@host.cn’) and not to the SENDER to protect the subscriber addresses.