Installing Postfix Admin on Cent OS / RedHat / Fedora

1. Install the Postfix Admin requirements using the command below.

#yum install mysql-server php-mysql php-imap httpd postfix dovecot

2. Download the latest stable version of Postfix Admin in .tar.gz format. 

Assuming you got the file postfixadmin-2.3.2.tar.gz and it is located on your Desktop,

 type in the commands below to extract and to put it into its proper directory.
 

#tar xvfz postfixadmin-2.3.2.tar.gz

#mv postfixadmin-2.3.2 /usr/share/postfixadmin 

#vim /etc/httpd/conf.d/postfixadmin.conf

#
#  Web application to manage Postfix email server
#

Directory "/usr/share/postfixadmin"
Order Allow,Deny
Allow from all
Directory

Alias /postfixadmin /usr/share/postfixadmin
Alias /PostFixAdmin /usr/share/postfixadmin
Alias /PostfixAdmin /usr/share/postfixadmin

3. Edit the file /usr/share/postfixadmin/config.inc.php and update the following lines below.
$CONF['configured'] = true;
$CONF['postfix_admin_url'] = '/postfixadmin';
$CONF['database_type'] = 'mysqli';
$CONF['database_host'] = 'localhost';
$CONF['database_user'] = 'postfix';
$CONF['database_password'] = 'your_password';
$CONF['database_name'] = 'postfix';
$CONF['domain_path'] = 'YES';
$CONF['domain_in_mailbox'] = 'NO';
$CONF['encrypt'] = 'cleartext';
$CONF['emailcheck_resolve_domain] = 'NO';

#service mysqld start

4.Launch the MySQL command line tool using the command below.
mysql -u root -p

The default root password of MySQL is a blank password. Next, create a 
new MySQL database for Postfix Admin using the commands below.
mysql> CREATE DATABASE postfix;
mysql> CREATE USER postfix@localhost IDENTIFIED BY 'your_password';
mysql> GRANT ALL PRIVILEGES ON postfix.* TO postfix;

#service httpd start

5.Go to the Postfix Admin setup page at http://localhost/postfixadmin/setup.php and fill in the setup password. Next, click the Generate password hash.

6.Get the generated setup password hash and put it into the file /usr/share/postfixadmin/config.inc.php. Next, fill in the Setup password, Admin and Password and Password (again). Finally, click Add Admin to create a new admin account.

7. Go to the Postfix Admin login page at http://localhost/postfixadmin/ and login using your newly created admin account.

:)