Haraka SMTP Server

Haraka is a highly scalable Node.js email server designed for modularity and high performance. It features a robust plugin architecture, enabling developers to easily extend its functionality for tasks such as spam protection, custom routing, and authentication. Haraka excels as a filtering Message Transfer Agent (MTA) or a Mail Submission Agent (MSA) on port 587 with authentication, complementing traditional mail systems like Postfix or Exchange without attempting to be a mail store or IMAP server. The current stable version is 3.1.5, with frequent releases addressing bug fixes, dependency updates, and minor enhancements. Its key differentiators include an asynchronous, event-driven design for speed, excellent built-in spam protection capabilities through plugins, and an easily extensible system for handling complex mail flow scenarios with minimal code.