👉 Postfix is a DNS server used for managing mail servers (like Gmail), allowing users to store email addresses, unsubscribe from certain accounts, and create custom domains. It's designed to be lightweight and efficient for handling millions of emails. The "conf" part refers to configuration files that configure the postfix system, including routing rules for outgoing connections between services and the ability to modify DNS records based on incoming mail requests. For example: ``` POSTFIX_CONF = { 'mail' => ['host' => 'example.com', 'port' => 25], 'rules' => [ 'spam' => [1, 60], // 1 minute for spam messages ], } ```
