ATLANTA, Aug. 18, 2011—When is the best time to send email? It is a question marketers are constantly contemplating. Silverpop™, the only provider of a scalable, integrated email marketing and marketing automation platform provides an answer with its Send Time Optimization feature by sending email messages at the time each recipient is most likely to be checking his or her inbox. By using this feature The Girl Scouts of the USA experienced a 10 percent increase in average email open rates, a 12 percent increase in email....