Datadog provides visibility into email health and performance by integrating with popular email services such as Mailgun, SendGrid, and Amazon SES. These integrations offer metrics for deliverability and engagement, including the rate of successful deliveries, open rates, and unsubscribe rates. Additionally, Datadog's Log Management feature allows users to collect and standardize log data from these services, enabling them to generate custom metrics and track email performance by domain or other factors. By using these integrations and features, organizations can gain a comprehensive picture of their email health and performance, identify issues, and troubleshoot deliverability in real-time.