One of my notable successes was with a mid-sized e-commerce company that was struggling with low open rates and high unsubscribe rates. After conducting a thorough audit of their email marketing practices, I implemented a segmented email marketing strategy that personalized content based on user behavior and preferences. Within six months, their open rates increased by 35% and their conversion rates improved by 20%. Another success story involved a healthcare provider where a targeted email campaign resulted in a 50% increase in appointment bookings.