The company in October 2001, 88% of those B2B Lead who use the Internet. Daily purchased a product or service motivated by a promotional offer received via e-mail. DoubleClick currently has 287 clients on the Dartmail platform, which manages about 38 million addresses. You’ll be surprised at how much information you can gain by simply inserting a short survey into your communications. 8. Don’t use opaque methods to build the list. If an Internet user has heard about your company, about which he has a neutral or even positive opinion, and receives a message from you without requesting it, his perception may change for the worse. At the end of the day, you are sending spam and the point is to build an opt-in email list that can lead to a long-lasting database.