ZoneMTA is a modern outbound MTA cross platform and extendable server application. Modern outbound SMTP relay (MTA/MSA) built on Node.js and MongoDB (queue storage). It's kind of like Postfix for outbound but is able to use multiple local IP addresses and is easily extendable using plugins that are way more flexible than milters.
 
ZoneMTA provides granular control over routing different messages. Trusted senders can be routed through high-speed (more parallel connections) virtual "sending zones" that use high reputation IP addresses, less trusted senders can be routed through slower (less connections) virtual "sending zones" or through IP addresses with less reputation. In addition the server comes packed with features more common to commercial software, ie. message rewriting, IP warm-up or HTTP API for posting messages.

ZoneMTA is a modern outbound MTA cross platform and extendable server application. Modern outbound SMTP relay (MTA/MSA) built on Node.js and MongoDB (queue storage). It's kind of like Postfix for outbound but is able to use multiple local IP addresses and is easily extendable using plugins that are way more flexible than milters.

ZoneMTA - Modern outbound MTA cross platform and extendable server application

WildDuck is a modern mail server software for IMAP and POP3. Modern being scalable, unicode-first and API-controlled. You can bundle WildDuck with Haraka and ZoneMTA to create a complete mail server. It uses a distributed database (sharded + replicated MongoDB) as a backend for storing all data, including emails. It tries to follow Gmail in product design. If there's a decision to be made then usually the answer is to do whatever Gmail has done.

WildDuck Mail Server -  Self hosted modern mail server `

The deepOfix Mail Server makes it possible for organisations with minimal technical expertise to have robust messaging infrastructure. It has built in LDAP support, SMTP, POP3 and IMAP services.

deepOfix - Mail Server

Mireka is a mail server with SMTP, Mail Submission and POP3 services. It is also an SMTP proxy. As a proxy, it can help to prevent or diagnose mail problems, like outgoing backscatter spam. 
 
<ul>
<li>detailed logging</li>
<li>basic mail traffic statistics</li>
<li>filtering by DNSBL</li>
<li>filtering by SPF</li>
<li>accepting mail only for local domains and recipients</li>
<li>wildcards (regular expressions) can be used to specify local recipients</li>
<li>basic tarpit, to prevent e-mail address harvesting</li>
<li>loop detection</li>
<li>configurable maximum message size</li>
<li>easy implementation and installation of custom filters written in Java</li>
<li>separate Message Transfer Agent and Message Submission Agent ports: 25 and 587 by default</li>
<li>proxy functionality for incoming mails (both MSA and MTA)</li>
<li>the proxy can select from more than one backend server, based on the recipient</li>
<li>standalone (non-proxy) Message Submission Agent implementation with file system based mail queues</li>
<li>submission port authentication by IP address or by username-password pair through SMTP authentication</li>
<li>POP3 service for retrieving mail, file system based mail store</li>
<li>aliases, forward lists and (very) simple mail lists</li>
<li>Sender Rewriting Scheme (SRS) for SPF compatible forwarding</li>
<li>secure communication using STARTTLS on all services</li>
<li>"delayed" DSN reports on temporary failures</li>
<li>embeddable</li>
</ul>

Mireka is a mail server with SMTP, Mail Submission and POP3 services. It is also an SMTP proxy. As a proxy, it can help to prevent or diagnose mail problems, like outgoing backscatter spam. 

Mireka - Mail server and SMTP proxy

OpenChange is a portable Open Source implementation of Microsoft Exchange server and Exchange protocols. It provides a complete solution to interoperate with Microsoft Outlook clients or Microsoft Exchange servers. 
OpenChange client-side library is used in existing messaging clients and is the solution in new projects to communicate natively with Microsoft Exchange and Exchange-compatible servers. OpenChange server is a transparent Microsoft Exchange server replacement using native Exchange protocols and does not require any plugin installation in Outlook.

OpenChange is a portable Open Source implementation of Microsoft Exchange server and Exchange protocols. It provides a complete solution to interoperate with Microsoft Outlook clients or Microsoft Exchange servers.


OpenChange - Open Source implementation of Microsoft Exchange server

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

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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ZoneMTA - Modern outbound MTA cross platform and extendable server application

WildDuck Mail Server - Self hosted modern mail server `

deepOfix - Mail Server

Mireka - Mail server and SMTP proxy

OpenChange - Open Source implementation of Microsoft Exchange server

Java Email Server

CRSMail - JAVA based E-Mail server

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ZoneMTA - Modern outbound MTA cross platform and extendable server application

WildDuck Mail Server - Self hosted modern mail server `

deepOfix - Mail Server

Mireka - Mail server and SMTP proxy

OpenChange - Open Source implementation of Microsoft Exchange server

Java Email Server

CRSMail - JAVA based E-Mail server

TechStack

Tagcloud

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