And how does that prevent everyone whose hands touch the postcard from reading it?

Marking something confidential when it's being delivered from someone who should review it to someone else who should review it serves a purpose. It informs those individuals that the information is not something they should disclose carelessly.

But a postcard is - effectively - by it's very nature - disclosed carelessly. No privacy can be expected.

A postcard is like having a web page facing the Internet with a robots.text file that tells search engines "index me to the full extent".

To then expect no one to read what they find in their searches shows a serious lack of understanding of the term "publicly available".

To then mark said page as "confidential" while allowing full public access - well... it's like someone walking down the street in their birthday suit with multihued paint on their body, hair done up to look like the Statue Of Liberty yelling "don't look at me"!

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