 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

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.
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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

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

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

ZoneMTA - Modern outbound MTA cross platform and extendable server application

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