Opt in emails refer to the email list of people who have opted or chosen to receive information about a product and service. They submit their emails with the website that collects this information. It enables the target clients to get relevant information easily. This opt in emails are useful for the advertiser also as it helps them to identify their target consumers and promote their site to them. When they get the email list and use it for their marketing campaign then they are able to promote their website better and get good traffic at it. So if someone needs to get quality traffic at his website then he can buy emails list through the online media company. This would make his email marketing campaign more successful and help him to enjoy a better click through rate. Since the email is sent to the target consumers it is also more cost effective and helps you to get relevant traffic at your website. it is however important to make sure that you buy your opt in emails list through a reliable online media company that uses fair means to collect updated information about the same. it is economical to buy email lists and promote your site through the same.