I have been searching for more details and this really seems to be a Japan Post ONLY interpretation of and response to the recent inane TSA ruling regarding printer cartridges weighing 16oz or more sent as air cargo on passenger aircraft destined for the USA.
Just like with the DOT regs regarding air shipment of Lithium batteries and products containing them, the Japan Post has just decided to refuse all packages over 453g rather than determine if they contain the offending printer cartridge or not. Frankly, it actually makes sense given the stupidity of these regs coming out of the USA. Why should their employees be held responsible for enforcement of this ruling? Given the substancial loss of revenue, I am sure they did not make this decision lightly.
Notch another win for Bin Laden. And I am sure the Japan offices of FedEX, UPS, and DHL are having an early Xmas party tonight too.