My game is a free HTML5 to be played online.

When I want to reach the players by email, I see this: 

There aren't any buyers or owners eligible to receive an email.

Am I getting it right that there are no possible emails for free games? I have to name the price for my game in order to send any emails?

In my opinion,  it would be cool to send these emails at least to players who follow me or added my game to their collection. I think it means they are interested in game enough.