Maddy Mail Server implements all functionality required to run a e-mail server. It can send messages via SMTP (works as MTA), accept messages via SMTP (works as MX) and store messages while providing access to them via IMAP. In addition to that it implements auxiliary protocols that are mandatory to keep email reasonably secure (DKIM, SPF, DMARC, DANE, MTA-STS). It replaces Postfix, Dovecot, OpenDKIM, OpenSPF, OpenDMARC and more with one daemon with uniform configuration and minimal maintenance cost.

Maddy - Composable all-in-one mail server

Postal is a complete and fully featured mail server for use by websites & web servers. Think Sendgrid, Mailgun or Postmark but open source and ready for you to run on your own servers. Postal was developed by aTech Media to serve its own mail processing requirements and we have since decided that it should be released as an open source project for the community.
 
The application has been running in production for us for nearly 6 months and we will be continuing to use it ourselves and support its ongoing development. If you have any questions about getting up and running, just post an issue.

Postal is a complete and fully featured mail server for use by websites & web servers. Think Sendgrid, Mailgun or Postmark but open source and ready for you to run on your own servers. Postal was developed by aTech Media to serve its own mail processing requirements and we have since decided that it should be released as an open source project for the community.

Postal - A fully featured open source mail delivery platform for incoming & outgoing e-mail

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 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

Mailu is a simple yet full-featured mail server as a set of Docker images. The project aims at providing people with an easily setup, easily maintained and full-featured mail server while not shipping proprietary software nor unrelated features often found in popular groupware.
 
Its features include: 
<ul>
<li>Standard email server, IMAP and IMAP+, SMTP and Submission</li>
<li>Advanced email features, aliases, domain aliases, custom routing</li>
<li>Web access, multiple Webmails and administration interface</li>
<li>User features, aliases, auto-reply, auto-forward, fetched accounts</li>
<li>Admin features, global admins, announcements, per-domain delegation, quotas</li>
<li>Security, enforced TLS, Letsencrypt!, outgoing DKIM, anti-virus scanner</li>
<li>Antispam, auto-learn, greylisting, DMARC and SPF</li>
<li>Freedom, all FOSS components, no tracker included</li>
</ul>

Mailu is a simple yet full-featured mail server as a set of Docker images. The project aims at providing people with an easily setup, easily maintained and full-featured mail server while not shipping proprietary software nor unrelated features often found in popular groupware.

Mailu - Mail server as a set of Docker images

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

Rspamd is an advanced spam filtering system that allows evaluation of messages by a number of rules including regular expressions, statistical analysis and custom services such as URL black lists. It supports Regular expressions filtering, SPF, DKIM, DNS black list, URL black lists, Fuzzy hashes etc.
 
According to this spam score and the user's settings, Rspamd recommends an action for the MTA to apply to the message, for example, to pass, reject or add a header. Rspamd is designed to process hundreds of messages per second simultaneously, and provides a number of useful features.

Rspamd is an advanced spam filtering system that allows evaluation of messages by a number of rules including regular expressions, statistical analysis and custom services such as URL black lists. It supports Regular expressions filtering, SPF, DKIM, DNS black list, URL black lists, Fuzzy hashes etc.

Rspamd  - Fast, free and open-source spam filtering system

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Maddy - Composable all-in-one mail server

Postal - A fully featured open source mail delivery platform for incoming & outgoing e-mail

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

Mailu - Mail server as a set of Docker images

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

Rspamd - Fast, free and open-source spam filtering system

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Maddy - Composable all-in-one mail server

Postal - A fully featured open source mail delivery platform for incoming & outgoing e-mail

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

Mailu - Mail server as a set of Docker images

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

Rspamd - Fast, free and open-source spam filtering system

TechStack

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