 Haraka is a highly scalable node.js email server with a modular plugin architecture. Haraka can serve thousands of concurrent connections and deliver thousands of messages per second. Haraka and plugins are written in asynchronous JS and are very fast. Haraka has very good spam protection (see plugins) and works well as a filtering MTA. It also works well as a MSA running on port 587 with auth and dkim_sign plugins enabled. 
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Haraka has a scalable outbound mail delivery engine built in. Mail marked as relaying (such as via an auth plugin) is automatically queued for outbound delivery.

Haraka is a highly scalable node.js email server with a modular plugin architecture. Haraka can serve thousands of concurrent connections and deliver thousands of messages per second. Haraka and plugins are written in asynchronous JS and are very fast. Haraka has very good spam protection (see plugins) and works well as a filtering MTA. It also works well as a MSA running on port 587 with auth and dkim_sign plugins enabled.

Haraka - A fast, highly extensible, and event driven SMTP server

Modoboa is a mail hosting and management platform including a modern and simplified Web User Interface. It provides useful components such as an administration panel or a webmail. Modoboa integrates with well known software such as Postfix or Dovecot. A SQL database (MySQL, PostgreSQL or SQLite) is used as a central point of communication between all components.

Modoboa - Mail hosting made simple

Mail-in-a-Box helps individuals take back control of their email by defining a one-click, easy-to-deploy SMTP+everything else server: a mail server in a box. Mail-in-a-Box lets you become your own mail service provider in a few easy steps. It’s sort of like making your own gmail, but one you control from top to bottom. Technically, Mail-in-a-Box turns a fresh cloud computer into a working mail server. But you don’t need to be a technology expert to set it up.

Mail-in-a-Box - One click easy-to-deploy SMTP server

C# Email Server (CES). Implements SMTP and POP3 components that can be used as a standalone server or as components in other applications. It is a port of the Java Email Server (JES). This component allows a program to accept incoming emails and process them using user defined logic.

C# Email Server - SMTP and POP3 Email Server in CSharp

JES is a multi-featured hybrid MTA/MDA server written in the java programming language. It supports TLS, SSL, SMTP authentication, spam control and lot more. 

Java Email Server

Mailin is an smtp server that listens for emails, parses them and posts them as json to the url of your choice. It checks the incoming emails dkim, spf, spam score (using spamassassin) and tells you in which language the email is written. Mailin can be used as a standalone application directly from the command line, or embedded inside a node application.

Mailin - Artisanal Inbound Emails for Every Web App

CRSMail a 100% JAVA based E-Mail server. It supports SMTP, POP3, Plugins, Can listen on multiple ports, Log's everything to a log file etc.

CRSMail - JAVA based E-Mail server

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Haraka - A fast, highly extensible, and event driven SMTP server

Modoboa - Mail hosting made simple

Mail-in-a-Box - One click easy-to-deploy SMTP server

C# Email Server - SMTP and POP3 Email Server in CSharp

Java Email Server

Mailin - Artisanal Inbound Emails for Every Web App

CRSMail - JAVA based E-Mail server

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Projects

Haraka - A fast, highly extensible, and event driven SMTP server

Modoboa - Mail hosting made simple

Mail-in-a-Box - One click easy-to-deploy SMTP server

C# Email Server - SMTP and POP3 Email Server in CSharp

Java Email Server

Mailin - Artisanal Inbound Emails for Every Web App

CRSMail - JAVA based E-Mail server

TechStack

Tagcloud

License