An opt-in list is a critical and important component for any kind of Internet-based business. Big, medium, small and even the very niche players can benefit from an opt-in list, as it has the capability to stuff some extra cash into their pockets. Look around the Internet yourself and scour for the big e-commerce boys – you will see that all of them, without exception, feature an opt-in list on their website.

An opt-in list is a marketing tool. You'll have seen many fields on websites that scream "Subscribe to our newsletter/product promos, etc." – these are opt-in fields where the surfer fills in his email, thereby consenting to receiving communication from that website. The website that collects the email then keeps communicating with the subscriber and keeps him updated on the topic to which he has subscribed.

As the subscriber voluntarily submits his email ID, it is understood that there is mutual consent between the website and the subscriber. This is why opt-in emails are not consider