Compliance with Regulations: Having a request date helps you comply with email marketing regulations such as GDPR and CAN-SPAM Act, which require you to prove that consent was given to receive emails. Segmentation: It allows you to segment your email list based on the time of subscription, which can be useful for targeting specific campaigns. Tracking Engagement: You can measure how long a subscriber has been on your list, which helps in understanding their engagement level and optimizing your re-engagement strategies.