/var/www/html/xerxes-frontend/config/conf.php

Set:

$CYRUS = array(
'HOST'  => '<name of mail system>',
'PORT'  => 143,
'ADMIN' => 'cyrus',
'PASS'  => '<the cyrus password>' 
);	

$DB = array(
'TYPE'  => 'mysql',
'USER'  => 'mail',
'PASS'  => '<the mysql user mail's password>',
'PROTO' => 'unix',       // set to "tcp" for TCP/IP
'HOST'  => '<the mysql ip>',
'NAME'  => 'mail'

If you wish to enable support for SQLWhite, a postfix Whitelist/blacklist server, enable this option.

$sqlwhite = 1;

If you wish to add error-logging to Xerxes add this to bottom of script:

error_reporting(E_ALL);
ini_set("log_errors",1);
ini_set("error_log","/var/log/xerxes.log");

Then create the log itself in the shell:

touch /var/log/xerxes.log
chown apache:apache xerxes.log