Postfix
self-hosted, mail agents

Postfix is a fast, easy-to-administer, and secure mail transfer agent (MTA) that serves as a replacement for Sendmail. It is widely used for routing and delivering email on Unix-based systems. Postfix emphasizes performance, scalability, and security, making it a popular choice for both small-scale setups and large enterprise environments. With its straightforward configuration and robust feature set, Postfix offers reliable mail delivery while minimizing administrative overhead.

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