Email deduplication is the process of identifying and removing duplicate email addresses from a database or mailing list. This technique helps to streamline email communication and prevent recipients from receiving multiple copies of the same email. By eliminating duplicate entries, email deduplication ensures that messages are delivered efficiently and effectively, saving time and resources for both senders and recipients. It also helps to maintain the integrity and accuracy of email databases, ensuring that contacts are not bombarded with redundant or irrelevant information. In short, email deduplication is a vital tool for optimizing email campaigns and improving overall email management.