Open Rates: Low open rates indicate that the email subject line or sender name is not compelling enough. Click-Through Rates: Low CTR suggests that the email content is not engaging or relevant to the audience. Bounce Rates: High bounce rates may indicate poor list quality or deliverability issues. Unsubscribe Rates: A high number of unsubscribes can signal that the content is not meeting audience expectations. Spam Complaints: A rise in spam complaints can damage your sender reputation and affect deliverability.