A reactivation email is a targeted message sent to a previously engaged customer or subscriber with the goal of reigniting their interest and encouraging them to take action. This type of email is typically used by businesses to reconnect with inactive customers, remind them of the value of their products or services, and entice them to resume their relationship. It often includes personalized content and incentives to motivate the recipient to re-engage, making it a powerful tool for rekindling customer loyalty and driving conversions.