Postfix is an Mail Transfer Agent (MTA) that enables the routing and delivery of emails to external accounts with Simple Mail Transport Protocol (SMTP). It is a cross-platform server suited to installation on Operating Systems similar to UNIX. Postfix follows a modular structure where several smaller independently executable components constitute the whole. It boasts of an advanced configuration that ensures protection from data leakage, abuse, and spam. Robust Queue Manager Postfix boasts of a truly state-of-the-art Queue Manager powered by an advanced scheduling algorithm that enables faster and smoother mail queue handling. Supremely Secure Postfix employs the least privilege principle to ensure maximum security. While higher privilege processes never trust the lower privilege ones, it allows the processes to run independently if they have the minimum privilege. Additionally, you can disable the modules you do not need to further enhance the security features. Smooth Execution Postfix is designed to detect stressful environments and instances of shortage of resources such as memory or disk space. By allowing the system to recover out of such situations through non-interference, it offers are stable, smooth, and error-free performance. Flexible yet Simple to Use Postfix constitutes of different programs and sub-systems arranged in a manner that you can tune any component according to your need. Despite its flexibility, it is easy to use since it employs simple configuration files and lookup tables for handling addresses and forwarding. Besides, its basis in the least surprise principle aligns it perfectly with the user expectations.