diff -Naur squirrelmail-1.4.13/config/config_local.php /usr/share/squirrelmail/config/config_local.php
--- squirrelmail-1.4.13/config/config_local.php 2007-07-10 10:52:53.000000000 -0400
+++ /usr/share/squirrelmail/config/config_local.php     2006-08-30 06:53:58.000000000 -0400
@@ -7,10 +7,11 @@
  * Don't do it unless you know what you're doing.
  * Use standard PHP syntax, see config.php for examples.
  *
- * @copyright © 2002-2007 The SquirrelMail Project Team
+ * @copyright © 2002-2006 The SquirrelMail Project Team
  * @license http://opensource.org/licenses/gpl-license.php GNU Public License
- * @version $Id: config_local.php 12522 2007-07-10 14:52:53Z kink $
+ * @version $Id: config_local.php,v 1.2.2.3 2006/04/14 22:27:07 jervfors Exp $
  * @package squirrelmail
  * @subpackage config
  */
 
+?>
\ No newline at end of file
diff -Naur squirrelmail-1.4.13/config/config.php /usr/share/squirrelmail/config/config.php
--- squirrelmail-1.4.13/config/config.php       1969-12-31 19:00:00.000000000 -0500
+++ /usr/share/squirrelmail/config/config.php   2006-08-30 06:53:58.000000000 -0400
@@ -0,0 +1,176 @@
+<?php
+
+/**
+ * SquirrelMail Configuration File
+ * Created using the configure script, conf.pl
+ */
+
+global $version;
+$config_version = '1.4.0';
+$config_use_color = 1;
+
+$org_name      = "$domain";
+$org_logo      = SM_PATH . 'images/sm_logo.png';
+$org_logo_width  = '308';
+$org_logo_height = '111';
+$org_title     = "SquirrelMail $version";
+$signout_page  = '';
+$frame_top     = '_top';
+
+$provider_uri     = 'http://www.squirrelmail.org/';
+
+$provider_name     = 'SquirrelMail';
+
+$motd = "";
+
+$squirrelmail_default_language = 'en_US';
+
+$imapServerAddress      = 'localhost';
+$imapPort               = 143;
+$useSendmail            = true;
+$smtpServerAddress      = 'localhost';
+$smtpPort               = 25;
+$sendmail_path          = '/usr/sbin/sendmail';
+$pop_before_smtp        = false;
+$imap_server_type       = 'uw';
+$invert_time            = false;
+$optional_delimiter     = '/';
+
+$default_folder_prefix          = 'mail/';
+$trash_folder                   = 'Trash';
+$sent_folder                    = 'Sent';
+$draft_folder                   = 'Drafts';
+$default_move_to_trash          = true;
+$default_move_to_sent           = true;
+$default_save_as_draft          = true;
+$show_prefix_option             = true;
+$list_special_folders_first     = true;
+$use_special_folder_color       = true;
+$auto_expunge                   = true;
+$default_sub_of_inbox           = false;
+$show_contain_subfolders_option = true;
+$default_unseen_notify          = 2;
+$default_unseen_type            = 1;
+$auto_create_special            = true;
+$delete_folder                  = false;
+$noselect_fix_enable            = false;
+
+$default_charset          = 'iso-8859-1';
+$data_dir                 = "$SITE_ROOT/var/squirrelmail/data/";
+$attachment_dir           = "$SITE_ROOT/var/squirrelmail/attachments/";
+$dir_hash_level           = 0;
+$default_left_size        = '150';
+$force_username_lowercase = false;
+$default_use_priority     = true;
+$hide_sm_attributions     = false;
+$default_use_mdn          = true;
+$edit_identity            = true;
+$edit_name                = true;
+$allow_thread_sort        = true;
+$allow_server_sort        = true;
+$allow_charset_search     = true;
+$uid_support              = true;
+
+$plugins[0] = 'delete_move_next';
+$plugins[1] = 'squirrelspell';
+$plugins[2] = 'newmail';
+
+$theme_css = '';
+$theme_default = 0;
+$theme[0]['PATH'] = SM_PATH . 'themes/default_theme.php';
+$theme[0]['NAME'] = 'Default';
+$theme[1]['PATH'] = SM_PATH . 'themes/plain_blue_theme.php';
+$theme[1]['NAME'] = 'Plain Blue';
+$theme[2]['PATH'] = SM_PATH . 'themes/sandstorm_theme.php';
+$theme[2]['NAME'] = 'Sand Storm';
+$theme[3]['PATH'] = SM_PATH . 'themes/deepocean_theme.php';
+$theme[3]['NAME'] = 'Deep Ocean';
+$theme[4]['PATH'] = SM_PATH . 'themes/slashdot_theme.php';
+$theme[4]['NAME'] = 'Slashdot';
+$theme[5]['PATH'] = SM_PATH . 'themes/purple_theme.php';
+$theme[5]['NAME'] = 'Purple';
+$theme[6]['PATH'] = SM_PATH . 'themes/forest_theme.php';
+$theme[6]['NAME'] = 'Forest';
+$theme[7]['PATH'] = SM_PATH . 'themes/ice_theme.php';
+$theme[7]['NAME'] = 'Ice';
+$theme[8]['PATH'] = SM_PATH . 'themes/seaspray_theme.php';
+$theme[8]['NAME'] = 'Sea Spray';
+$theme[9]['PATH'] = SM_PATH . 'themes/bluesteel_theme.php';
+$theme[9]['NAME'] = 'Blue Steel';
+$theme[10]['PATH'] = SM_PATH . 'themes/dark_grey_theme.php';
+$theme[10]['NAME'] = 'Dark Grey';
+$theme[11]['PATH'] = SM_PATH . 'themes/high_contrast_theme.php';
+$theme[11]['NAME'] = 'High Contrast';
+$theme[12]['PATH'] = SM_PATH . 'themes/black_bean_burrito_theme.php';
+$theme[12]['NAME'] = 'Black Bean Burrito';
+$theme[13]['PATH'] = SM_PATH . 'themes/servery_theme.php';
+$theme[13]['NAME'] = 'Servery';
+$theme[14]['PATH'] = SM_PATH . 'themes/maize_theme.php';
+$theme[14]['NAME'] = 'Maize';
+$theme[15]['PATH'] = SM_PATH . 'themes/bluesnews_theme.php';
+$theme[15]['NAME'] = 'BluesNews';
+$theme[16]['PATH'] = SM_PATH . 'themes/deepocean2_theme.php';
+$theme[16]['NAME'] = 'Deep Ocean 2';
+$theme[17]['PATH'] = SM_PATH . 'themes/blue_grey_theme.php';
+$theme[17]['NAME'] = 'Blue Grey';
+$theme[18]['PATH'] = SM_PATH . 'themes/dompie_theme.php';
+$theme[18]['NAME'] = 'Dompie';
+$theme[19]['PATH'] = SM_PATH . 'themes/methodical_theme.php';
+$theme[19]['NAME'] = 'Methodical';
+$theme[20]['PATH'] = SM_PATH . 'themes/greenhouse_effect.php';
+$theme[20]['NAME'] = 'Greenhouse Effect (Changes)';
+$theme[21]['PATH'] = SM_PATH . 'themes/in_the_pink.php';
+$theme[21]['NAME'] = 'In The Pink (Changes)';
+$theme[22]['PATH'] = SM_PATH . 'themes/kind_of_blue.php';
+$theme[22]['NAME'] = 'Kind of Blue (Changes)';
+$theme[23]['PATH'] = SM_PATH . 'themes/monostochastic.php';
+$theme[23]['NAME'] = 'Monostochastic (Changes)';
+$theme[24]['PATH'] = SM_PATH . 'themes/shades_of_grey.php';
+$theme[24]['NAME'] = 'Shades of Grey (Changes)';
+$theme[25]['PATH'] = SM_PATH . 'themes/spice_of_life.php';
+$theme[25]['NAME'] = 'Spice of Life (Changes)';
+$theme[26]['PATH'] = SM_PATH . 'themes/spice_of_life_lite.php';
+$theme[26]['NAME'] = 'Spice of Life - Lite (Changes)';
+$theme[27]['PATH'] = SM_PATH . 'themes/spice_of_life_dark.php';
+$theme[27]['NAME'] = 'Spice of Life - Dark (Changes)';
+$theme[28]['PATH'] = SM_PATH . 'themes/christmas.php';
+$theme[28]['NAME'] = 'Holiday - Christmas';
+$theme[29]['PATH'] = SM_PATH . 'themes/darkness.php';
+$theme[29]['NAME'] = 'Darkness (Changes)';
+$theme[30]['PATH'] = SM_PATH . 'themes/random.php';
+$theme[30]['NAME'] = 'Random (Changes every login)';
+$theme[31]['PATH'] = SM_PATH . 'themes/midnight.php';
+$theme[31]['NAME'] = 'Midnight';
+$theme[32]['PATH'] = SM_PATH . 'themes/alien_glow.php';
+$theme[32]['NAME'] = 'Alien Glow';
+$theme[33]['PATH'] = SM_PATH . 'themes/dark_green.php';
+$theme[33]['NAME'] = 'Dark Green';
+$theme[34]['PATH'] = SM_PATH . 'themes/penguin.php';
+$theme[34]['NAME'] = 'Penguin';
+
+$default_use_javascript_addr_book = false;
+$addrbook_dsn = '';
+$addrbook_table = 'address';
+
+$prefs_dsn = '';
+$prefs_table = 'userprefs';
+$prefs_user_field = 'user';
+$prefs_key_field = 'prefkey';
+$prefs_val_field = 'prefval';
+$no_list_for_subscribe = false;
+$smtp_auth_mech = 'login';
+$imap_auth_mech = 'login';
+$use_imap_tls = false;
+$use_smtp_tls = false;
+$session_name = 'SQMSESSID';
+
+@include SM_PATH . 'config/config_local.php';
+
+/**
+ * Make sure there are no characters after the PHP closing
+ * tag below (including newline characters and whitespace).
+ * Otherwise, that character will cause the headers to be
+ * sent and regular output to begin, which will majorly screw
+ * things up when we try to send more headers later.
+ */
+?>
\ No newline at end of file
diff -Naur squirrelmail-1.4.13/functions/global.php /usr/share/squirrelmail/functions/global.php
--- squirrelmail-1.4.13/functions/global.php    2007-11-27 16:26:57.000000000 -0500
+++ /usr/share/squirrelmail/functions/global.php        2008-03-29 01:09:02.000000000 -0400
@@ -9,6 +9,23 @@
  * @package squirrelmail
  */
 
+ /* Ensim virtualization hack */
+ if (($_GET['site_domain'] != '') || ($_POST['site_domain'] != '')){
+    if ($_GET['site_domain'] != ''){
+       $s_Domain = $_GET['site_domain'];
+    } else {
+       $s_Domain = $_POST['site_domain'];
+   }
+    $i_nPos = strpos($s_Domain,'/');
+    if ($i_nPos > 0){
+       $s_Domain = substr($s_Domain,0,$i_nPos);
+    }
+    if (preg_match('/^([-0-9A-Z]+\.)+([0-9A-Z]){2,4}$/i', trim(htmlspecialchars(str_replace('/','',$s_Domain))))) {
+      define('SITE_DOMAIN',$s_Domain); 
+      
+    }
+ }
+
 /**
  * Set constants
  */
@@ -120,6 +137,12 @@
     sqstripslashes($_POST);
 }
 
+/** Save the current domain (virtual) or load from session */
+/** Fix variables for virtualization hack */
+ if (defined('SITE_DOMAIN')){
+     sqsession_register(SITE_DOMAIN,'site_domain');
+ }
+
 /**
  * returns true if current php version is at mimimum a.b.c
  *
diff -Naur squirrelmail-1.4.13/functions/prefs.php /usr/share/squirrelmail/functions/prefs.php
--- squirrelmail-1.4.13/functions/prefs.php     2007-08-09 02:52:17.000000000 -0400
+++ /usr/share/squirrelmail/functions/prefs.php 2008-03-29 00:09:56.000000000 -0400
@@ -16,6 +16,16 @@
 require_once(SM_PATH . 'functions/global.php');
 require_once(SM_PATH . 'functions/plugin.php');
 
+/* virtualization patch */
+ sqgetGlobalVar('site_domain', $domain );
+if ($domain != ""){
+    $SITE_ROOT         = "/home/virtual/$domain";
+    $org_name          = "$domain";
+    $org_title = "E-Mail - $username";
+    $data_dir            = "/home/virtual/$domain/var/squirrelmail/data/";
+    $attachment_dir      = "/home/virtual/$domain/var/squirrelmail/attachments/";
+}
+
 /** include this for error messages */
 include_once(SM_PATH . 'functions/display_messages.php');
 
diff -Naur squirrelmail-1.4.13/src/login.php /usr/share/squirrelmail/src/login.php
--- squirrelmail-1.4.13/src/login.php   2007-11-18 23:20:34.000000000 -0500
+++ /usr/share/squirrelmail/src/login.php       2008-03-29 00:37:06.000000000 -0400
@@ -161,6 +161,8 @@
 
 $username_form_name = 'login_username';
 $password_form_name = 'secretkey';
+/* Ensim virtualization hack */
+$domain_form_name = 'site_domain';
 do_hook('login_top');
 
 
@@ -213,6 +215,8 @@
                                    addInput($username_form_name, $loginname_value),
                                 'left', '', 'width="70%"' )
                                 ) . "\n" .
+/* Ensim virtualization hack */
+                           getDomainTag().
                             html_tag( 'tr',
                                 html_tag( 'td',
                                     _("Password:") ,
@@ -240,5 +244,24 @@
 echo '</form>' . "\n";
 
 do_hook('login_bottom');
+
+/* Ensim virtualization hack */
+ function getDomainTag()
+ {
+   global $domain_form_name;
+
+    if (!defined('SITE_DOMAIN')){
+      return html_tag( 'tr',
+          html_tag( 'td',
+             _("Domain:") ,
+             'right', '', 'width="30%"' ) .
+          html_tag( 'td',addInput($domain_form_name, ""),
+                                'left', '', 'width="*"' )
+            ) . "\n";
+    } else {
+       return '<input type="hidden" name="'.$domain_form_name.'" value="' . htmlspecialchars(str_replace('/','',SITE_DOMAIN)) . '" />' . "\n";
+    }
+ }
+
 ?>
 </body></html>
diff -Naur squirrelmail-1.4.13/src/redirect.php /usr/share/squirrelmail/src/redirect.php
--- squirrelmail-1.4.13/src/redirect.php        2007-08-29 03:25:36.000000000 -0400
+++ /usr/share/squirrelmail/src/redirect.php    2008-03-29 01:08:30.000000000 -0400
@@ -49,6 +49,11 @@
 if(!sqGetGlobalVar('squirrelmail_language', $squirrelmail_language) || $squirrelmail_language == '') {
     $squirrelmail_language = $squirrelmail_default_language;
 }
+/* Ensim virtualization patch */
+sqGetGlobalVar('site_domain',$site_domain);
+if ($site_domain){
+    sqsession_register ($site_domain,'site_domain');
+}
 
 if (!sqgetGlobalVar('mailtodata', $mailtodata)) {
     $mailtodata = '';
@@ -78,6 +83,11 @@
     /* remove redundant spaces */
     $login_username = trim($login_username);
 
+    /* Ensim virtual domain support */
+    if (is_valid_email($login_username)==false) {
+       $login_username = $login_username.'@'.$domain;
+    }    
+
     /* Verify that username and password are correct. */
     if ($force_username_lowercase) {
         $login_username = strtolower($login_username);
@@ -165,7 +175,16 @@
     $redirect_url .= urlencode($mailtodata);
 }
 
+/* Ensim virtualization hack */
+function is_valid_email ($address) { 
 
+    return (preg_match( 
+        '/^[-!#$%&\'*+\\.\/0-9=?A-Z^_`{|}~]+'.   // the user name 
+        '@'.                                     // the ubiquitous at-sign 
+        '([-0-9A-Z]+\.)+' .                      // host, sub-, and domain names 
+        '([0-9A-Z]){2,4}$/i',                    // top-level domain (TLD) 
+        trim($address))); 
+} 
 
 /* Write session data and send them off to the appropriate page. */
 session_write_close();