diff -urN ../z-push-2.6.4+0.orig/src/backend/searchpasswd/config.php.dist ./src/backend/searchpasswd/config.php.dist
--- ../z-push-2.6.4+0.orig/src/backend/searchpasswd/config.php.dist	1970-01-01 03:00:00.000000000 +0300
+++ ./src/backend/searchpasswd/config.php.dist	2023-06-19 17:31:35.267083000 +0300
@@ -0,0 +1,29 @@
+<?php
+/***********************************************
+* File      :   searchpasswd/config.php
+* Project   :   Z-Push
+* Descr     :   configuration file for the
+*               BackendSearchPasswd backend.
+*
+* Created   :   19.06.2023
+*
+* Copyright 2023 Victor Ustugov corvax+z-push@mta.org.ua
+*
+* This program is free software: you can redistribute it and/or modify
+* it under the terms of the GNU Affero General Public License, version 3,
+* as published by the Free Software Foundation.
+*
+* This program is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+* GNU Affero General Public License for more details.
+*
+* You should have received a copy of the GNU Affero General Public License
+* along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*
+* Consult LICENSE file for details
+************************************************/
+
+define('PASSWD_FILE', '/usr/local/etc/passwd.imap');
+
+define('FIX_DOMAIN_SEARCH', true);
diff -urN ../z-push-2.6.4+0.orig/src/backend/searchpasswd/searchpasswd.php ./src/backend/searchpasswd/searchpasswd.php
--- ../z-push-2.6.4+0.orig/src/backend/searchpasswd/searchpasswd.php	1970-01-01 03:00:00.000000000 +0300
+++ ./src/backend/searchpasswd/searchpasswd.php	2023-06-19 18:09:57.017372000 +0300
@@ -0,0 +1,178 @@
+<?php
+/***********************************************
+* File      :   searchpasswd.php
+* Project   :   Z-Push
+* Descr     :   The searchpasswd can be used to
+*               implement an alternative way perform
+*               searches.
+*               This is a stub implementation.
+*
+* Created   :   19.06.2023
+*
+* Copyright 2023 Victor Ustugov corvax+z-push@mta.org.ua
+*
+* This program is free software: you can redistribute it and/or modify
+* it under the terms of the GNU Affero General Public License, version 3,
+* as published by the Free Software Foundation.
+*
+* This program is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+* GNU Affero General Public License for more details.
+*
+* You should have received a copy of the GNU Affero General Public License
+* along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*
+* Consult LICENSE file for details
+************************************************/
+
+/*********************************************************************
+ * The BackendSearchPasswd is a stub to implement own search funtionality
+ *
+ * If you wish to implement an alternative search method, you should implement the
+ * ISearchProvider interface like the BackendSearchPasswd backend
+ */
+
+require_once("backend/searchpasswd/config.php");
+
+class BackendSearchPasswd implements ISearchProvider{
+    private $passwd_file = null;
+
+    /**
+     * Constructor
+     * initializes the searchprovider to perform the search
+     *
+     * @access public
+     * @return
+     * @throws StatusException, FatalException
+     */
+    public function __construct() {
+        if (!defined('PASSWD_FILE')) {
+            ZLog::Write(LOGLEVEL_ERROR, "BackendSearchPasswd(): PASSWD_FILE not defined");
+            return false;
+        } elseif (!file_exists(PASSWD_FILE)) {
+            ZLog::Write(LOGLEVEL_ERROR, sprintf("BackendSearchPasswd(): file %s not found", PASSWD_FILE));
+            return false;
+        } elseif (!is_readable(PASSWD_FILE)) {
+            ZLog::Write(LOGLEVEL_ERROR, sprintf("BackendSearchPasswd(): file %s not readable", PASSWD_FILE));
+            return false;
+        } else {
+            $this->passwd_file = PASSWD_FILE;
+            return true;
+        }
+    }
+
+    /**
+     * Indicates if a search type is supported by this SearchProvider
+     * Currently only the type ISearchProvider::SEARCH_GAL (Global Address List) is implemented
+     *
+     * @param string        $searchtype
+     *
+     * @access public
+     * @return boolean
+     */
+    public function SupportsType($searchtype) {
+        return ($searchtype == ISearchProvider::SEARCH_GAL);
+    }
+
+    /**
+     * Searches the GAL
+     *
+     * @param string                        $searchquery        string to be searched for
+     * @param string                        $searchrange        specified searchrange
+     * @param SyncResolveRecipientsPicture  $searchpicture      limitations for picture
+     *
+     * @access public
+     * @return array        search results
+     * @throws StatusException
+     */
+    public function GetGALSearchResults($searchquery, $searchrange, $searchpicture) {
+        $items = array();
+
+        if ($this->passwd_file and ($fh = fopen($this->passwd_file, 'r'))) {
+            while (($buffer = fgets($fh, 4096)) !== false) {
+                list($username, $passwd, $uid, $gid, $name, $homedir, $shell) = preg_split('/:/', $buffer);
+                if ((mb_stripos($username, $searchquery) !== false) or (mb_stripos($name, $searchquery) !== false)) {
+                    $item[SYNC_GAL_DISPLAYNAME] = ($name ? $name : $username);
+                    $item[SYNC_GAL_LASTNAME] = ($name ? $name : $username);
+                    $item[SYNC_GAL_EMAILADDRESS] = $username;
+
+                    if (defined('FIX_DOMAIN_SEARCH') and (FIX_DOMAIN_SEARCH === true)) {
+                        $item[SYNC_GAL_DISPLAYNAME] = preg_replace('/@(\S+)/', ' ($1)', $item[SYNC_GAL_DISPLAYNAME]);
+                        $item[SYNC_GAL_FIRSTNAME] = preg_replace('/@(\S+)/', ' ($1)', $item[SYNC_GAL_FIRSTNAME]);
+                        $item[SYNC_GAL_LASTNAME] = preg_replace('/@(\S+)/', ' ($1)', $item[SYNC_GAL_LASTNAME]);
+                        list($local_part, $domain) = preg_split('/@/', $item[SYNC_GAL_EMAILADDRESS]);
+                        if (
+                                (mb_stripos($domain, $searchquery) !== false)
+                            and (mb_stripos($local_part, $searchquery) === false)
+                            and (mb_stripos($item[SYNC_GAL_DISPLAYNAME], $searchquery) === false)
+                        ) {
+                            $item[SYNC_GAL_DISPLAYNAME] .= ' (' . $domain . ')';
+                            $item[SYNC_GAL_LASTNAME] .= ' (' . $domain . ')';
+                        }
+                    }
+
+                    $items[] = $item;
+                }
+            }
+            fclose($fh);
+
+//            ZLog::Write(LOGLEVEL_DEBUG, sprintf("got total items: %s", print_r($items, true)));
+
+            $searchtotal = count($items);
+
+            $rangestart = 0;
+            $rangeend = 50;
+            if (!empty($searchrange) and ($searchrange != '0')) {
+                $pos = strpos($searchrange, '-');
+                if ($pos !== false) {
+                    $rangestart = substr($searchrange, 0, $pos);
+                    $rangeend = substr($searchrange, ($pos + 1));
+                }
+            }
+
+            while (count($items) > $rangeend + 1) array_pop($items);
+            for ($i = 0; $i < $rangestart; $i++) {
+                if (count($items) > 0) array_shift($items);
+            }
+            $items['range'] = $rangestart . '-' . ($rangestart + count($items) - 1);
+            $items['searchtotal'] = $searchtotal;
+
+//            ZLog::Write(LOGLEVEL_DEBUG, sprintf("got ranged items: %s", print_r($items, true)));
+        }
+
+        return $items;
+    }
+
+    /**
+     * Searches for the emails on the server
+     *
+     * @param ContentParameter $cpo
+     *
+     * @return array
+     */
+    public function GetMailboxSearchResults($cpo){
+        return array();
+    }
+
+    /**
+    * Terminates a search for a given PID
+    *
+    * @param int $pid
+    *
+    * @return boolean
+    */
+    public function TerminateSearch($pid) {
+        return true;
+    }
+
+    /**
+     * Disconnects from the current search provider
+     *
+     * @access public
+     * @return boolean
+     */
+    public function Disconnect() {
+        return true;
+    }
+}