The email ID is crucial in email marketing for several reasons:
Authentication: Verifying the sender's identity to ensure that the email is from a legitimate source. Personalization: Using the recipient's email ID to tailor content and make the communication more relevant. Segmentation: Categorizing email IDs into different groups based on demographics, behavior, or preferences. Tracking: Monitoring the performance of email campaigns by tracking opens, clicks, and conversions associated with specific email IDs.