Several metrics can help you identify quality dilution:
Open Rates: A declining open rate is a clear indicator that your emails are not capturing your audience's interest. Click-through Rates: Low CTRs suggest that your content is not compelling enough to prompt action. Unsubscribe Rates: A high unsubscribe rate indicates dissatisfaction with your email content or frequency. Spam Complaints: An increase in spam complaints can harm your sender reputation and deliverability.