For this exercise, I will create an email opt-in form using MailChimp. MailChimp is one of the coolest email services marketing provider in the world. According to wikipedia, it has 7 million users that sends 10 billion emails (!) a month. Picture it as your virtual postman who sends letters to everyone on your email list.
By creating an email opt-in form using MailChimp, you can automatically create the sign up form, the “Thank You” page, the confirmation email, the Unsubscribe message and many more. Most importantly, it MailChimp manages your list of subscribers based on the campaigns they enlisted.