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For all mail except the first, the same thing that happens if you send a letter with no postage: the sender will receive a request to pay after delivery. If the sender is unknown the recipient will receive a request to pay (which can be appealed).

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I mail a fair amount of physical media using the postzegelcode. If you put a return address, PostNL just returns the letter with a sticker on it saying the postage was not enough. They won't deliver it.

If they deliver the letter to the return address, what prevents you from writing the target address as the return address and getting it delivered for free?

They know approximately the area the return address should be at, and they also know who used the app to buy the code.

It's also some kind of fraud in most jurisdictions, or subject to an extra fee if discovered.

Germany's new stamps aren't stamped any more - a QR code gets scanned and logged instead - so people thought they were lucky when they received unstamped letters and decided to re-use the stamp. They got hit with a fine.

What if the postal system has a bug - and one of these people used a newly bought stamp? Rare but not unheard of[1].

[1]: https://amp.cnn.com/cnn/2024/01/13/business/uk-post-office-f...

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