Seventy-one percent of marketers are using responsive design to optimize their emails for mobile devices, according to a new report from Forrester Research. The report, which included feedback from 89 email marketers, also found that almost two-fifths of email marketers are not integrating email efforts with other channels. In addition, only 19 percent of these marketers have included email in their multichannel mix for three years or more. The report also revealed that 61 percent of email marketers haven't yet tested open-time personalization and 58 percent have yet to adopt in-email transactions.