There are several indicators that an email campaign might be over personalized:
High unsubscribe rates: If a significant number of recipients are unsubscribing, it might be due to discomfort with how much you know about them. Negative feedback: Direct complaints or negative comments about your emails can signal that people are feeling uneasy. Low engagement: A drop in open or click-through rates may indicate that your audience is not responding well to your highly personalized content.