Regardless of how many piles of mail you have, this Half Hour Organizing Project is about setting up a mail station.
Once you have it set up, start managing new mail at your mail station. Then, each day spend 15 minutes going through an old pile of mail. Even it takes you all year to go through the old piles, you will still be making progress! By having the new mail station in place, it will prevent you from creating new piles of mail.
So much about getting organized and staying organized is changing your habits. Change the habit of setting the mail down to “deal with it later.” Later never comes and the piles accumulate. This mail station will support a change in habit!