There are many electronic magazines out there that have a very large subscriber base. Better yet, they are often looking for authors. You can use this to your advantage and send an article (after inquiring, of course). After your article is accepted, you will be able to include a link back to your website or squeeze page. If people find your article interesting and compelling, they are likely visit to sign up for your list!
Remember, you don't have to stick to just one e-zine. The more you submit to over a period of time, the more likely you are to be seen by as many people in your niche as possible. Getting your name out there and branding yourself is half the battle.