Monitoring certain metrics can help you identify if you're overloading your subscribers:
Open Rates: A declining open rate may be a sign of email fatigue. Click-Through Rates (CTR): A drop in CTR can indicate that recipients are not engaging with your content. Unsubscribe Rates: A high or increasing unsubscribe rate could suggest you're sending too many emails. Spam Complaints: An uptick in spam complaints is a clear indicator of overloading.