Minimise the amount of paper postage you get.
More About The Challenge
There are two big ways to reduce the post that you get.
First, determine which of your service providers still send you bills or correspondence via post. Get in touch with them and switch to paperless. If they don't provide the option, make them aware it's something you would be interested in.
The second way is to let deliverers of advertisements know you don't wish to accept junk mail. A simple sticker on your letterbox or mailbox should suffice in helping reduce the junk mail you get.
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