Duplicate email addresses can lead to several issues, such as:
Increased costs: Many email marketing platforms charge based on the number of emails sent. Duplicates can inflate these costs unnecessarily. Reduced engagement: Recipients may be annoyed if they receive the same email multiple times, leading to lower engagement rates. Skewed analytics: Duplicates can distort performance metrics, making it difficult to accurately assess the effectiveness of your campaigns. Spam complaints: Multiple emails can increase the likelihood of recipients marking your emails as spam, which can harm your sender reputation.