Haraka is described as 'Open source SMTP server written in Node.js which provides extremely high performance coupled with a flexible plugin system allowing Javascript programmers full access to change the behaviour of the server' and is an app. There are seven alternatives to Haraka for a variety of platforms, including Linux, Mac, Self-Hosted, Roundcube and Windows apps. The best Haraka alternative is Postfix, which is both free and Open Source. Other great apps like Haraka are Mail-in-a-box, Exim, OpenSMTPD and Sendmail.
Postfix is a mail transfer agent (MTA) that routes and delivers electronic mail. It attempts to be fast, easy to administer, and secure. The software is also known by its former names VMailer and IBM Secure Mailer.
Postfix is the most popular Mac & Linux alternative to Haraka.
Postfix is the most popular Open Source & free alternative to Haraka.
Mail-in-a-box is the most popular Self-Hosted alternative to Haraka.
Exim is a message transfer agent (MTA) developed at the University of Cambridge for use on Unix systems connected to the Internet.
OpenSMTPD is a FREE implementation of the server-side SMTP protocol as defined by RFC 5321, with some additional standard extensions. It allows ordinary machines to exchange e-mails with other systems speaking the SMTP protocol.
Sendmail is a general purpose internetwork email routing facility that supports many kinds of transfer and delivery methods, including the Simple Mail Transfer Protocol (SMTP) used for email transport over the Internet.
NikaMail is a portable, extendable, zero-config email server. It is designed to perform automation tasks, provide access to mailboxes (port 110), serve as a mail transfer agent (port 587) and mail exchange service (port 25). NikaMail supports TLS.
A lightweight mail server with SMTP and POP3 support. It mainly used as store-and-forward mail server with POP access to spooled messages or it can be used as a personal internet mail server.
E-MailRelay is the most popular Windows alternative to Haraka.
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