The Australian Post Office is linking digital files to physical mail through stamps as reported in the article QR Codes on Stamps Digitally Enhance Snail Mail by Julie Campbell. A very interesting article with a future trend being made available now.
Australia Post is providing mail senders with an entirely new service. With these barcodes, customers in Australia can link them to video messages that they have recorded and then send them as stamps on physical envelopes that can be scanned by the recipient and viewed on their smartphones or tablets.
Digital Philately 
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