I sometimes get mail for the previous resident. I could never get answers on my obligations in this case. I usually cross out the name and address, circle the return address, write “retourner”, and drop it in a red box.

Some letters for past residents have no return address. I wondered what bPost does with them, so I brought them to bPost clerk. They noticed a barcode and said that will be used to track down the sender. I was surprised about that, because I thought those barcodes were meant to automate shipping to the destination.

There are 75 4-state bars, which I suppose is enough data to contain both the sender and recipient. So if you re-use windowed envelopes, it’s good to know whoever you send the letter to could work out who you originally received correspondence from, if they are sneaky and motivated.