Personalize email subject refers to the act of customizing the subject line of an email to make it more relevant and appealing to the recipient. This can include using the recipient’s name, referencing a previous interaction, or tailoring the subject to their specific interests or needs. By personalizing the email subject, the sender aims to capture the recipient’s attention and increase the chances of the email being opened and read. This technique is often used in marketing and communication strategies to create a more personalized and engaging experience for the recipient.