In Email Marketing, ensuring that your subscriber list is clean and free of bots is crucial. Mathematical CAPTCHAs can help in the following ways: - Preventing Bot Subscriptions: It ensures that only real humans are subscribing to your email list. - Improving Deliverability: A clean list improves your sender reputation, ensuring better email deliverability. - User Experience: Simple arithmetic problems are easy for humans to solve, making it a user-friendly solution compared to more complex CAPTCHAs.