Improved Deliverability: By testing emails in a sandbox environment, marketers can identify and fix issues that might prevent their emails from reaching the inbox. Spam Score Reduction: Sandboxing helps in evaluating the spam score of an email, allowing marketers to make necessary adjustments to avoid being flagged as spam. Compliance: It ensures that emails adhere to regulations such as GDPR and CAN-SPAM, reducing the risk of legal issues. Performance Optimization: Marketers can test different elements of their emails, such as subject lines and CTAs, to find the most effective combinations.