Roundcube is an open source webmail application with a slick, desktop-like interface.
It is multilingual (already comes with 60+ languages) and offers most of the functionality you can expect from a webmail like:
- full support for MIME and HTML messages
- composing messages with attachments
- find-as-you-type address book integration
- Richtext/HTML message composing
- Forwarding messages with attachments
- searching messages and contacts
- threaded message listing
- spell checking
Messages can be managed with drag'n drops, users can have multiple sender identities and it can work with unlimited users/messages.
Roundcube is built with PHP and requires MySQL, PostgreSQL, SQLite or MSSQL for storing the data.
It has a plugin API for building extensions and adding custom features.
Requirements: PHP 5.2.1+, MySQL, PostgreSQL, SQLite or MSSQL, IMAP & SMTP server
Xeams is a free e-mail server software that supports POP3, SMTP, IMAP & works in all major operating systems (Windows, Linux, Solaris, MacOSX).
It comes with a powerful spam engine which can stop most of them by default & lets you to customize the rules further.
The server can work in 3 modes:
- Full Email Server – no other email server is required
- Spam Wirewall – will be a layer between messages & your e-mail server
- Hybrid Mode – will both work as a mail server & block spams on your e-mail infrastructure
The server is controlled from a web-based interface which also helps you to live-monitor the system.
It has support for detailed logging, mailing lists, customized footers & much more.
The company also offers another free product named Synametrics Smtp Gateway which again works in multi-OS.
Synametrics Smtp Gateway can be used as a backup SMTP server which will send e-mails when the primary server fails or can be used to load-balance outgoing messages.
Requirements: No Requirements
Compatibility: All Major Operating Systems
Hastymail is a free IMAP webmail software (open source) built with PHP.
The application is lightweight, has a clean interface & compatible with all major browsers including mobile ones.
With its plugin support, new features can be added. Some available plugins are: calendar, filtering, RSS/Atom.
Hastymail can be customized via CSS & has a PHP based template system.
It has Vcard based contact list with multiple import/export ability & many other features.
Requirements: PHP
