Duplicate entries can negatively impact your email marketing efforts in several ways:
Increased Costs: Most email marketing platforms charge based on the number of subscribers. Duplicate entries can inflate your subscriber count, leading to higher costs. Poor Analytics: Duplicates can skew your analytics, making it difficult to gauge the actual performance of your campaigns. Damage to Reputation: Sending multiple emails to the same person can be annoying and may lead to unsubscribes or being marked as spam, damaging your sender reputation.