Last Modified 2007-11-05 by Guest

Installing Horde Groupware Webmail Edition on CentOS 5

Horde Groupware Webmail Edition is a free, enterprise ready, browser based communication suite. Users can read, send and organize email messages and manage and share calendars, contacts, tasks and notes with the standards compliant components from the Horde Project. Horde Groupware Webmail Edition bundles the separately available applications IMP, Ingo, Kronolith, Turba, Nag and Mnemo.


  • CentOS 5.0 i386 (OS)
    • Horde Groupware Webmail Edition 1.0.3 (October 2 2007)
    • Apache 2.2.3 (http server)
    • MySQL 5.0.22 (db server)
    • Postfix 2.3.3 (mail server)
    • Dovecot 1.0 (IMAP)

Set up your host name and address

This is only necessary if you didn't do it at installation.

Use system-config-network-tui to set up IP, Netmask and Gateway:


Edit /etc/sysconfig/network and set your hostname:




Edit /etc/resolv.conf and add your DNS servers:



Edit /etc/hosts to something like this, according to your system settings:

# Do not remove the following line, or various programs

# that require network functionality will fail.         localhost.localdomain        localhost     yourhostname.yourdomain.com  yourhostname

::1               localhost6.localdomain6      localhost6

Restart network:

service network restart

If your using GUI interface (like gnome), you may need to restart it:

init 6

Installing prerequisites

yum install -y gettext httpd mysql mysql-server dovecot postfix system-switch-mail perl

yum install -y php php-mysql php-xml php-imap php-mbstring php-mcrypt php-pecl-Fileinfo php-pecl-memcache \ 

               php-pear-DB php-pear-File php-pear-Log php-pear-Mail-Mime php-pear-Auth-SASL php-pear-Date \ 

               php-pear-HTTP-Request php-pear-Mail php-pear-Net-Sieve php-pear-Net-Socket php-pear-Net-SMTP

Configuring Postfix and Dovecot

Turn off sendmail:

service sendmail stop

chkconfig sendmail off


(select postfix)

Configure Postfix and Dovecot:

postconf -e 'home_mailbox = Maildir/'

Edit /etc/dovecot.conf and add the following to the end of the file:

# to allow the creation of mail subfolders

mail_location = maildir:~/Maildir

namespace private {

separator = /

prefix = ""

inbox = yes


# Enable IMAP protocol

protocols = imap

To configure the rest of postfix, such as domain name and secure connections, take a look at this nice tutorial: http://fedorasolved.org/server-solutions/postfix-mail-server

Start services

service httpd restart

chkconfig httpd on

service postfix restart

chkconfig postfix on

service dovecot restart

chkconfig dovecot on

service mysqld restart

chkconfig mysqld on

Configure mysqld root password:

/usr/bin/mysqladmin -u root password 'new-password'

Download Horde Groupware Webmail Edition and extract it

Get the latest stable version of Horde Groupware Webmail Edition from http://www.horde.org/download/app/?app=webmail.

Extract files and rename folder:

tar zxf horde-webmail-*.tar.gz -C /var/www/html/

mv /var/www/html/horde-*/ /var/www/html/horde/

Creating database and tables in MySQL

Run the setup.php script:

cd /var/www/html/horde/scripts/


If asked, choose /horde.

Press 1; choose mysql; Persistent connection: 0; Username horde; Choose a password for mysql-user-horde; Unix sockets; Location null; DB name horde;

Press 2; yes; root; root-mysql-password.

Press 3; specify an existing IMAP user to have horde administration permissions (i.e. your current linux user).

Create user horde in MySQL and grant horde DB the proper permissions

Edit a text file and change the password for the same as in Step 1 above:

USE mysql;

REPLACE INTO user (host, user, password)

    VALUES (



-- IMPORTANT: Change this password!



REPLACE INTO db (host, db, user, select_priv, insert_priv, update_priv,

                 delete_priv, create_priv, drop_priv, index_priv)

    VALUES (




        'Y', 'Y', 'Y', 'Y',

        'Y', 'Y', 'Y'


-- Make sure that priviliges are reloaded.


Save the file as createuser.mysql (or something else) and load it as mysql stdin:

mysql --user=root --password=mysqlrootpassword < createuser.mysql

Configure Apache and PHP

Add a "horde.conf" file to /etc/httpd/cond.d:


# Horde


Alias /horde /var/www/html/horde

<Directory /var/www/html/horde>

    # Uncomment the following 3 lines to make Horde locally accessible only

    #Order Deny,Allow

    #Deny from all

    #Allow from

    Options +FollowSymLinks

    # horde.org's recommended PHP settings:

    php_admin_flag safe_mode off

    php_admin_flag magic_quotes_runtime off

    php_flag session.use_trans_sid off

    php_flag session.auto_start off

    php_admin_flag file_uploads on

    # Optional - required for weather block in Horde to function

    php_admin_flag allow_url_fopen on

    # If horde dies while trying to handle large email file attachments,

    #  you are probably hitting PHP's memory limit.  Raise that limit here,

    #  but use caution

    # Set to your preference - memory_limit should be at least 32M

    #  and be greater than the value set for post_max_size

    #php_value memory_limit 32M

    #php_value post_max_size 20M

    #php_value upload_max_filesize 10M

    # /usr/share/pear is needed for PEAR. /var/www/html/horde is needed for Horde itself

    # TODO: Set an appropriate include_path, too. Might even increase speed a bit.

    php_admin_value open_basedir "/var/www/html/horde:/var/www/html/horde/config:/usr/share/pear:/tmp"

    php_admin_flag register_globals off


<Directory /var/www/html/horde/config>

    Order Deny,Allow

    Deny from all


# Deny access to files that are not served directly by the webserver

<DirectoryMatch "^/var/www/html/horde/(.*/)?(config|lib|locale|po|scripts|templates)/(.*)?">

    Order Deny,Allow

    Deny from all


# Deny access to the test.php files except from localhost

<LocationMatch "^/horde/(.*/)?test.php">

    Order Deny,Allow

    Deny from all

    Allow from


Change horde.conf permission:

chmod 0644 -v /etc/httpd/conf.d/horde.conf 

Increase memory_limit option in /etc/php.ini to 32MB:

memory_limit = 32M

Restart httpd:

service httpd restart

Check if everything is alright

Open the following address in your browser:


Security configuration

Secure config files:

chown apache:root -R /var/www/html/horde/config

chown apache:root -R /var/www/html/horde/*/config

chmod -R go-rwx /var/www/html/horde/config

chmod -R go-rwx /var/www/html/horde/*/config

Secure scripts:

chown -R root:root /var/www/html/horde/scripts

chown -R root:root /var/www/html/horde/*/scripts

chmod -R go-rwx /var/www/html/horde/scripts

chmod -R go-rwx /var/www/html/horde/*/scripts

Secure test.php:

chmod a-rwx /var/www/html/horde/test.php

chmod a-rwx /var/www/html/horde/*/test.php

Finishing configuration

Open the following url in your browser and log into horde with the administrator user (defined above in Option 2 when creating databases):


(PS: use full URL address, with host and domain name)

Fell free to change other options, as you like. The good thing about Horde Groupware Webmail Edition is it comes pretty much configured and ready for use!

Remember to restart httpd after you make changes:

service httpd restart