Squirrelmail login = @meudominio.com.br

Pessoal esse é meu login.php, como faço para fazer minha solução funcionar, alguem pode me ajudar, não sei nada de php

<?php

/**
* login.php -- simple login screen
*
* Copyright (c) 1999-2005 The SquirrelMail Project Team
* Licensed under the GNU GPL. For full terms see the file COPYING.
*
* This a simple login screen. Some housekeeping is done to clean
* cookies and find language.
*
* @version $Id: login.php,v 1.98.2.8 2005/06/22 13:45:35 jangliss Exp $
* @package squirrelmail
*/

/**
* Path for SquirrelMail required files.
* @ignore
*/
define('SM_PATH','../');

/* SquirrelMail required files. */
require_once(SM_PATH . 'functions/strings.php');
require_once(SM_PATH . 'config/config.php');
require_once(SM_PATH . 'functions/i18n.php');
require_once(SM_PATH . 'functions/plugin.php');
require_once(SM_PATH . 'functions/constants.php');
require_once(SM_PATH . 'functions/page_header.php');
require_once(SM_PATH . 'functions/html.php');
require_once(SM_PATH . 'functions/global.php');
require_once(SM_PATH . 'functions/forms.php');

/**
* $squirrelmail_language is set by a cookie when the user selects
* language and logs out
*/
set_up_language($squirrelmail_language, TRUE, TRUE);

/**
* Find out the base URI to set cookies.
*/
if (!function_exists('sqm_baseuri')){
require_once(SM_PATH . 'functions/display_messages.php');
}
$base_uri = sqm_baseuri();

/*
* In case the last session was not terminated properly, make sure
* we get a new one.
*/

sqsession_destroy();

header('Pragma: no-cache');

do_hook('login_cookie');

$loginname_value = (sqGetGlobalVar('loginname', $loginname) ? htmlspecialchars($loginname) : '');

/* Output the javascript onload function. */

$header = "<script language=\"JavaScript\" type=\"text/javascript\">\n" .
"\n".
"</script>\n";
$custom_css = 'none';
displayHtmlHeader( "$org_name - " . _("lOGIN"), $header, FALSE );

echo '<body text="#000000" bgcolor="#FFFFFF" link="#0000CC" vlink="#0000CC" alink="#0000CC" onload="squirrelmail_loginpage_onload();">' .
"\n" . addForm('redirect.php', 'post');

$username_form_name = 'login_username';
$password_form_name = 'secretkey';
do_hook('login_top');

if(sqgetGlobalVar('mailto', $mailto)) {
$rcptaddress = addHidden('mailto', $mailto);
} else {
$rcptaddress = '';
}

/* If they don't have a logo, don't bother.. */
if (isset($org_logo) && $org_logo) {
/* Display width and height like good little people */
$width_and_height = '';
if (isset($org_logo_width) && is_numeric($org_logo_width) &&
$org_logo_width>0) {
$width_and_height = " width=\"$org_logo_width\"";
}
if (isset($org_logo_height) && is_numeric($org_logo_height) &&
$org_logo_height>0) {
$width_and_height .= " height=\"$org_logo_height\"";
}
}

echo html_tag( 'table',
html_tag( 'tr',
html_tag( 'td',
'<center>'.
( isset($org_logo) && $org_logo
? '<img src="' . $org_logo . '" alt="' .
sprintf(_("%s Logo"), $org_name) .'"' . $width_and_height .
' /><br />' . "\n"
: '' ).
( (isset($hide_sm_attributions) && $hide_sm_attributions) ? '' :
'<small>' . sprintf (_("Compy Network Solution Provider"), $version) . '<br />' ."\n".
' ' . _("Pensou em Soluções Rede") . '<br />' . 'Pensou em compy...' . '</small>' . "\n" ) .
html_tag( 'table',
html_tag( 'tr',
html_tag( 'td',
'<b>' . sprintf (_("%s"), $org_name) . "</b>\n",
'center', '#DCDCDC' )
) .
html_tag( 'tr',
html_tag( 'td', "\n" .
html_tag( 'table',
html_tag( 'tr',
html_tag( 'td',
_("Usuário:") ,
'right', '', 'width="30%"' ) .
html_tag( 'td',
addInput($username_form_name, $loginname_value),
'left', '', 'width="*"' )
) . "\n" .
html_tag( 'tr',
html_tag( 'td',
_("Senha:") ,
'right', '', 'width="30%"' ) .
html_tag( 'td',
addPwField($password_form_name).
addHidden('js_autodetect_results', SMPREF_JS_OFF).
$rcptaddress .
addHidden('just_logged_in', '1'),
'left', '', 'width="*"' )
) ,
'center', '#ffffff', 'border="0" width="100%"' ) ,
'left', '#FFFFFF' )
) .
html_tag( 'tr',
html_tag( 'td',
'<center>'. addSubmit(_("Entrar")) .'</center>',
'left' )
),
'', '#ffffff', 'border="0" width="350"' ) . '</center>',
'center' )
) ,
'', '#ffffff', 'border="0" cellspacing="0" cellpadding="0" width="100%"' );
do_hook('login_form');
echo '</form>' . "\n";

do_hook('login_bottom');
?>
</body></html>