Try the following trick: mail is a mix of different kinds of junk. So unopened mail needs to be separated in order to sort it into the correct bin. Opening is not about reading and reading is only about checking if it can be binned directly. If you have similar tendencies as I do, this works wonders. You have you separate the envelopes that have plastic windows though, they belong to a different bin.
Try the following trick: mail is a mix of different kinds of junk. So unopened mail needs to be separated in order to sort it into the correct bin. Opening is not about reading and reading is only about checking if it can be binned directly. If you have similar tendencies as I do, this works wonders. You have you separate the envelopes that have plastic windows though, they belong to a different bin.