Future Me - Send an email to your future self
Letter to Yourself - Send a physical letter to your future self
Letterflix - Send letters and snail mail online to the USA, Europe, India, or anywhere in the world. Letterflix is the easiest and secure way to send letters and snail mail anywhere in the world from the comfort of your home.
Dabble Me - Your own private place to write. A journal/diary to help you remember what's happened in your life.
DocuPost - Sustainably mail letters, checks & postcards online from 75¢
Print Post - PrintPost puts your printer in the cloud.