We recommend to remove unresponsive customers to get a more accurate analysis of the marketing campaigns. During the holiday season, people receive many emails and your email might get lost underneath all the other mail. Therefore, you have to make your emails stand out and not forgettable. One suggestion is to send gift lists for customer and advise them on what to purchase for friends and family. Many people have no clue on what to purchase, you can provide suggestions and promote your own items.