It doesn't take C.S.I. investigators to determine why the "CSI Lifecycle Email Program" is a hit. Empowering reps to send the most relevant follow-up email after speaking with a customer is smart. True one-on-one conversation offers a sense of a customer's business needs and personal preferences, which helps decide which of eight emails - all with special offers - to send. Offers of Amazon gift cards are surely a loyalty builder, as are those with significant discounts appealing to small-business owners. And FedEx tracks how recipients react to the promotions.