When selecting an ESP, consider the following factors: - Ease of Use: The platform should have an intuitive interface. - Features: Ensure it offers essential features like email automation, segmentation, and A/B testing. - Deliverability: High deliverability rates are crucial for effective email marketing. - Analytics and Reporting: Comprehensive analytics help you measure the success of your campaigns. - Customer Support: Reliable customer support can assist you in resolving issues promptly.