E-mail is an important channel for b-to-b marketers looking to build prospective leads. B-to-b marketing is all about building leads and turning those leads into clients. According to a new study by e-mail services firm Silverpop, 24% of b-to-b marketers said that they are using e-mail to ensure "qualified leads are converting into appropriate sales opportunities," and 22% are "nurturing and converting initial inquires into qualified leads."