Sailthru is a customer engagement platform specializing in personalized marketing across email, web, and mobile channels. Founded in 2008 and acquired by CM Group (now Marigold) in 2019, Sailthru has established itself as a data-driven solution for media, publishing, retail, and e-commerce companies.

As an ESP, Sailthru offers a flexible email template builder with drag-and-drop functionality and advanced HTML editing options, allowing marketers to create responsive designs that dynamically adapt to individual user preferences and behaviors. The platform's Personalization Engine powers its approach to individualized content, product recommendations, and send-time optimization.

Sailthru differentiates itself through its predictive analytics capabilities, including its Lifecycle Optimizer for automated customer journeys and its interest-based user profiles that evolve over time. The platform's integrated approach to cross-channel personalization helps brands deliver consistent experiences while gaining unified insights into customer engagement and retention metrics.