. You don't have to send your subscribers email every single day, send them email only if you have information that you think will benefit your subscribers.
Building a quality opt-in email list isn't an overnight task. Many preparations and efforts are involved. I would suggest you to Join Internet Marketing forums to become friends with other experienced Internet Marketers to share ideas on what to do and what not to do, situation might be different for each of us but the general concepts are about the same.