Now I feel like emails (or social media) are the cheap ways to keep in contact with people. We're often drowned in them which makes a hand written mail really stand out above the rest.
Taking the time to write things down on paper is the way to go if you want someone to remember you. A hand written letter feels more personal than a digital one. I still have the letters that was sent to me in my youth.
When is the last time you've wrote, or received, a hand written letter?