Open Source Unix Shell Email Servers

Highly scalable/configurable Messaging Platform allowing users in a domain to be distributed on multiple hosts, has multiple queues. Provides virtual domains/users in MySQL. Modern MSP class qmail replacement with ESMTP, POP3/IMAP, QMTP, QMQP support

ISPConfig - ISP management and Hosting Control Panel. ISPConfig manages one or more webservers, mailservers, BIND DNS server, FTP servers, MySQL databases and virtual Servers with an easy to use webinterface for administrators, resellers and clients.

MailCleaner Open Source Edition is now discontinued but will continue under the spamtagger project https://github.com/SpamTagger [antispam] MailCleaner is an anti-spam / anti-virus filter SMTP gateway with user and admin web interfaces, quarantine, multi-domains, multi-templates, multi-languages. Using Bayes, RBLs, Spamassassin, MailScanner, ClamAV. Based on Debian. Enterprise ready. MailCleaner is an anti spam gateway installed between your mail infrastructure and the Internet. It includes a complete GNU/Linux OS and a graphical web interface for user and administrative access. It comes in the form of virtual machine templates.. - fully compatible with any SMTP mail server (Exchange, Zimbra, O365,...)

Fast-Pitch is a Linux web/mail server configuration tool. Automates download and install of free software, including Apache, ApacheToolBox, PHP, MySQL, phpMyAdmin, qmail, SquirrelMail, Courier-IMAP, ProFTPD, tinydns, osCommerce, MRTG, and more.

i-MSCP (internet Multi Server Control Panel) is an open-source project which allows the management of shared hosting environments on Linux servers. i-MSCP aims to provide an easy-to-use Web interface for end-users (administrators, resellers and clients) and to manage servers without any manual intervention on the filesystem.

EFortika is essentially a fully functional mail server built upon a combination of freely available open source software with a focus towards ease of deployment, management and security with insecure protocols disabled by default. The project aim is to produce a functional email server that can easily installed by the average sysadmin with minimal configuration and with an expectation of stability and security. The primary target audience is individuals keen to move away from public email services (see Gmail, Hotmail .etc) and towards their own low-cost privately managed email solution. The design of Efortika is scalable enough to suit many small to medium business needs however, larger scale deployments requiring modular or highly available solutions are not currently supported but are in included in the project plan. Please see the project wiki for further documentation, installation requirements and installation instructions: https://sourceforge.net/p/efortika/wiki/EFortika

Extensive High Availability Modules (XHAM) provides “active-active” failsafe solutions to your Linux Firewall, Gateway, Router, Email Server, NIDS (Snort), Proxy, Samba, MySQL (with NAS), and Apache.

Start/Stop the mail processes as needed, allowing your Syno to hibernate (sleep) in the quiet hours. Only to be used with Mail Station polling external mail server(s), i.e. NOT when you run Mail Server with own domain (because the server should keep running all the time then). Still, you can use Mail Server just as IMAP server and SMTP relay. Mail Relaxer is not intended to be used with Zarafa. Credits for the original idea go to Tobi "jahlives" from German Synology forum.

An antivirus software for email server that filter mails with dangerous attachment. It works in concatenation with procmail (sw by van den Berg). Don't need a database of signature because just don't permit executable attachments.

This is an email server in a box. Using ldap authentication for imap, pop3, smtp, and SSL/TLS versions of each. Includes web user-interface, web administration, web filters. Installs on top of RedHat in under 20 minutes by running one script.

Syron Qmail is a qmail distribution based on netqmail and qmail-sql which tries to unify several public available patches to include almost all modern mail server features into qmail (SQL User Database, SMTP AUTH/TLS, high load adjustments and more).

A small SMTP Server that is easy to use and allows for virus and SPAM checking.

A small shell script for Linux/Debian and derivates to check if a mail-adress is in use on a specific mail server or not

Cheescloth is a security script that is used to monitor and block email being brute force sent to your mail server by zombie machines in control by spammers and hackers. It also will catch and block hackers trying to hack your server via SSH connection

Want to install One of the powerful mail server (qmail), but do not want to go in the pains of going through various docs, then this piece of software is exactly what you might want. Just download and run the binary file provide currently supported on i

The deepOfix Mail Server makes it possible for organisations with minimal technical expertise to have robust server infrastructure. It offers unprecented ease of use, doesn't require prior GNU/Linux experience and is backed by a full-time support team.