Traffic from email marketing campaigns has an average conversion rate of 4.29 percent. This is higher than Search, which has 3 percent, Direct, which has 2.9 percent and Social, which has 1.8%.

Building a quality email list is key. You can use lead forms, pop-ups, promotions/giveaways, partnerships, and freemiums.

Services like MailChimp and Pardot allow you to automate your email sales funnel. You can also utilize a drip campaign, which is a method used in direct marketing to acquire customers through lead nurture programs. It involves sending marketing information to prospects repeatedly over longer periods of time in order to nurture prospects or leads through the marketing funnel.