Email marketing is the act of sending a commercial message, typically to a group of people, using email . In its broadest sense, every email sent to a potential or current customer could be considered email marketing . The data has 3 basic types : 1- Da ta collection : is a process of gathering informations about our customers that's can be "emails, numbers phone, behaviors etc" but in our case are "emails", there is many methods to get a data for example: purchase it from many sources. we can get it from our website through the newsletter. There is 3 techniques for getting a data: 1- Opt-in: Express permission by a customer, or a recipient of a mail, email, or other direct message to allow a marketer to send a merchandise, information, or more messages. The image bellow is an example of an opt-in form 2- D ouble opt-in : that mean when a person who has subscribed to your list h...