To get a holistic view of your email marketing efforts, consider these long term metrics:
Customer Retention Rate: Measures the percentage of customers who continue to engage with your brand over time. Revenue Per Email: Calculates the average revenue generated from each email sent. Customer Engagement Score: Evaluates the overall engagement of a customer with your email campaigns over a period of time. Email List Growth Rate: Tracks the rate at which your email list is growing, indicating the effectiveness of your list-building strategies.