So why not take advantage of this extremely powerful operation? The more people you have on your list, the more potential customers mailing list you have. It's been reported that up to 10% of subscribers to a newsletter will be converted into a sale. And these people are truly interested in what you have to say. When done correctly email marketing can become your most powerful way to generate sales. Your email list should only contain addresses for which people have willingly given you their contact info (i.e. "opt-in subscribers") - anything else mailing list is deemed 'spam'. Most email addresses are submitted to lists via a form on a web-site. You can convince people to subscribe to your list in a variety ways, some more successful than others. In the next few lessons, I will supply you with the most powerful means of increasing your opt-in subscribers. But for now, I want to fill you in on the most persuasive and enticing incentives to offer your future opt-ins. The Most mailing list Compelling Opt-In Offers --visitors will be signing up left and right!-- § Offer a Free Newsletter. I know, you're thinking, "Free?