You are emailer #51, you send your steam name, and you only email once (we check). If you are #51 in our inbox and you don't include a steam name, or email us more than once, you will not win.
Matthewhiu was today's winner of a free key. He was the 51st person to email us with his steam name. Congratulations to Matthewhiu and good luck to everyone for tomorrow's free key (details here).