Generally, the secret in building or increasing your mailing list is to take good care of those who are already signed in. This way they will be mailing list driven to promote your site to people that they know. One thing I've learned and that I'd like to share with you is the importance of having a mailing list. What sort of mailing list am I talking about? In this case it's a list of names and email addresses.
That list can also include home addresses. This 'list' forms your database of customers who have opted in which is crucial for online success. Many take mailing list the view that you can have a profitable internet business without a list. That's almost like saying you can have a profitable candy store with no customers. If no one buys from you then you will not make money, period!
Consider your list as being the most important aspect to your business because it is your customer base. Treat your customers well; Let mailing list me say that again... Treat your customers well!! I can't emphasise this enough. Give them solutions to their problems and they will come back to you over and over again and give you repeat business.