You can never go wrong with email. It is a tried and true digital marketing tool. Email can be made incredibly personal, and in the digital world we live in, it can often be the best way to connect with an individual. Social media and other forms of digital marketing are a great complement to your marketing strategy, but they'll never be able to replace email. For an excellent pairing to any marketing outreach, choose email.
One way to sell a consumer something in the future is simply to get his or her permission in advance.
Seth Godin – Author of Permission Marketing