From their website: "We seek to unite Christians worldwide by connecting them with each other. 100 million Christians around the globe are currently suffering for their faith, and we need YOU to stand with them in their suffering through your letters. We will take the letters that you write and deliver them to those who are imprisoned, hiding, grieving, or struggling with their faith."
Click here to write to David, a persecuted convert from Islam in Ethiopia. You will need to click on to the instructions, write your own letter, and send it to the Open Doors address indicated.