Postfix, an open-source mail transfer agent (MTA) first released in 1997, remains a popular choice for organizations seeking a cost-effective email routing and delivery solution that also provides protection against issues such as spambots and malware. Datadog integrates with Postfix to enable comprehensive monitoring of email service performance by tracking key metrics like the size of incoming, active, and deferred queues. Monitoring these metrics helps establish a baseline for queue sizes and allows users to set alerts for deviations that may indicate performance issues. Datadog's integration enhances Postfix by not only collecting and visualizing metrics but also by correlating them with other systems, detecting outliers, and alerting on abnormal behavior. Users can easily configure Datadog to monitor Postfix and other infrastructure components by deploying the Datadog Agent, with additional support offered for other SMTP-based services like AWS SES.