RainLoop is a free webmail application based on PHP,
it’s free and open source, has modern user interface to handle large
number of email accounts without the need of any database connectivity,
besides non database connectivity it holds both SMTP and IMAP protocols to easily send/receive emails without any trouble.

RainLoop Key Features

1. Modern : Modern user interface, with drag’n’drop of
   files, progress bar for file uploading, browser notifications, embed
   images into messages, keyboard shortcuts, multi-language mails, etc.
2. Technological : Supports all latest mail server protocols, such as SMTP and IMAP. Multi-level caching engine allows for increasing performance of application and reducing load on mail and server.
3. Customizable : Highly customization options to
   customize interface layout using visual themes and support for
   multi-language interface, with new languages easily added.
4. Social : Integration with Facebook, Google and Twitter enables users to log-in with their social network credentials.
5. Simplicity : Provides easy way to installing and
   upgrading RainLoop application without any technical skills. The
   built-in upgrade tool allows users to easily obtain new version and
   plugins from a single click via admin interface.
6. Security : Built-in protection module clears
   hazardous HTML entities for preventing several attacks. In addition,
   token-based security engine is used for protection from CSRF attacks.
7. Extensibility : Plugin system provides several
   features like changing password, global address, compose screen, keeping
   user settings in database, etc are easily integrated into application.
8. Performance : The application well designed with
   efficient memory use in mind, so it can work smoothly even on low-end
   servers. But still in most cases, the performance and speed of
   application directly depends on performance of server and bandwidth
   available.

Requirement of RainLoop

In order to install RainLoop application we require:

1. GNU/Linux operating system
2. Apache web server
3. PHP version 5.3 or higher
4. PHP Extensions

RainLoop Demo and Preview

1. Watch Demo of application – http://demo.rainloop.net/

Testing Environment

1. Operating System – CentOS 6.5 & Ubuntu 13.04
2. Apache – 2.2.15
3. PHP – 5.5.3
4. RainLoop – 1.6.3.715

Installation of RainLoop Webmail in Linux

As I mentioned earlier, that RainLoop Webmail is developed in PHP for Linux with Apache. So, you must have a running Web server with PHP installed on the system along with PHP modules such as cURL, ibxml, dom, openssl, DateTime, PCRE, etc. To install these all required packages, you can use package manager tool called yum or apt-get according to your Linux distribution.

Step 1: Install Apache, PHP and MySQL

Install on Red Hat based systems using yum command.

# yum install httpd
# yum install mysql mysql-server
# yum install php php-mysql php-xml pcre php-common curl 
# service httpd start
# service mysqld start

Install on Debian based systems using apt-get command.

# apt-get install apache2
# apt-get install mysql-server mysql-client
# apt-get install php5 libapache2-mod-auth-mysql libmysqlclient15-dev php5-mysql curl libcurl3 libcurl3-dev php5-curl php5-json
# service apache2 start
# service mysql start

Step 2: Download and Install RainLoop Webmail

Now go the official RainLoop site and download the latest source tarball (i.e version 1.6.3.715) using below link.

1. http://rainloop.net/downloads/

Alternatively, you may also use following ‘wget‘ command to download the latest source package and extract it to a Apache web root directory. For example, ‘/var/www/rainloop‘ or ‘/var/www/html/rainloop‘.

On Red Hat based Systems

# mkdir /var/www/html/rainloop		
# cd /var/www/html/rainloop
# wget http://repository.rainloop.net/v1/rainloop-1.6.3.715-f96ed936916b7f3d9039819323c591b9.zip
# unzip rainloop-1.6.3.715-f96ed936916b7f3d9039819323c591b9.zip
# rm rainloop-*.zip

On Debian based Systems

# mkdir /var/www/rainloop		
# cd /var/www/webmail
# wget http://repository.rainloop.net/v1/rainloop-1.6.3.715-f96ed936916b7f3d9039819323c591b9.zip
# unzip rainloop-1.6.3.715-f96ed936916b7f3d9039819323c591b9.zip
# rm rainloop-*.zip

Note: You can also download the
latest version of RainLoop application without a need to deal with zip
archive, just use the following command in your terminal.

# curl -s http://repository.rainloop.net/installer.php | php

Step 3: Configure Permissions

After, extracting the package content, be sure to set correct
permissions for the files and directories before installing the product.
This is necessary to have running application with its default
configuration. This is also mandatory, when dealing manual upgrade or
restoring from backup. Please switch to application directory i.e. ‘/var/www/rainloop‘ or ‘/var/www/html/rainloop‘ and execute following commands thereon.

# find . -type d -exec chmod 755 {} \;
# find . -type f -exec chmod 644 {} \;

Now, set owner for the application recursively.

chown -R www-data:www-data .

Note: Depending on specific Linux distribution, user account for web server runs may vary (apache, www, www-data, nobody, nginx, etc.).

Step 4: Configure RainLoop via Admin Interface

There are two ways to configure the RainLoop application – using admin panel, or by modifying ‘application.ini‘
file manually from the terminal. But, most of the basic options are
configured via web interface, and that should suffix in most cases. To
access admin panel, use the following default login credentials.

1. URL : http://Your-IP-Address/rainloop/?admin
2. User : admin
3. Pass : 12345

Admin Login

Change Admin Password

Once, you logged-in it’s recommended to change the default password to protect the application from the malicious attacks.

Branding

You can customize your login screen by adding custom Titles, Descriptions and path to Logo.

Enable Contacts

To enable contacts feature, we need to use supported database. Here, we will be using MySQL as database for enabling contacts. So, create the database manually using the following commands on the terminal.

# mysql -u root -p
mysql> create database rainloop;
mysql> exit;

Now enable the contacts feature from the Admin Panel –> Contacts page.

Add Domains

You may add or configure your domains at Admin Panel –> Domains –> Add Domain Page. The recommended setting for adding domain is localhost i.e., 127.0.0.1 and Port 143 for IMAP and Port 25 for SMTP. Based on the server configuration, you may also select SSL/TLS for IMAPS/SMTPS and don’t forget to tick ‘Use short login form‘ checkbox.

Plugins – Enable Password Changing

This plugin add functionality to change the email account password.
To enable this plugin, you need to install a package called ‘poppassd‘ on the server.

# apt-get install poppassd	[on Debian based Systems]

On Red Hat based systems, you need to download and enable Razor’s Edge Repository for your specific distribution and then install the ‘poppassd’ package using the following command.

# yum install poppassd

Next, go to the Admin Panel –> Package section to install plugin.

Enable, the poppassd plugin from the Admin Panel > Plugins page and tick the ‘poppassd-change-password‘ box. Add the server details such 127.0.0.1, Port 106 and enter ‘*‘ for Allowed emails.