Improve email deliverability by identifying issues and applying best practices is a goal of Deliverability Insights, an internal tool developed to help companies improve their email deliverability. The tool is now being made available as a built-in feature in Resend now, allowing users to check their emails for best practices and optimize their deliverability. The insights are broken down into three categories: alignment with industry best practices, optimizations that could improve deliverability, and recommendations to further enhance deliverability. Deliverability Insights are currently available for free to all plans during the Beta phase, with plans to add more insights in the future.