I'll add a further point. Voltage does not have the names and addresses. The Judge said that privacy would be protected, but not how. No doubt he will elaborate on that when he actually issues his rulings. It could well be that Voltage have to produce the letter for approval, but it gets sent by an escrow service. We'll know in a couple of weeks.
"I'm quite sure there will not be any 'accidental' letters. Australia is not the US".
Why do you think they would be so stupid as to go down a path which their Australian lawyers will advise them will ensure that they will then lose this case and lead to other sanctions from the Federal Court of Australia?