Custom Email marketing application needed

I need a skilled programmer to build a custom email marketing application for us. For this email marketing program, we have thousands of recipients that will be receiving emails on a regular basis. Our company is an online directory of distributors for various products. We offer 50 types of products. Some customer may only want information on 3 or 4 certain types of products while other may want information on 8 or 9 types of products. When the customers sign up with us, they will specify which products they want information about. The email they receive should only provide information about the products they specify. Our team here will create a brief article for each type of product so the email application will insert the specific article based on the recipient's preferences. For this email application, it must be relatively automatic. Every Tuesday morning, emails will be sent out When we create the email, we will be sending customers information about new products that they specified. The emails will all follow a standard format, the only difference is the content. You must have already successfully created a similar application.