diff --git a/ajax.php b/ajax.php
index 4256bd97c..1751c9ce9 100644
--- a/ajax.php
+++ b/ajax.php
@@ -104,16 +104,32 @@ switch (get('op')) {
 
         break;
 
-    case 'hook':
+    case 'hook-lock':
         $hook_id = filter('id');
         $hook = Hook::find($hook_id);
 
-        $init = filter('init');
-        if (!empty($init)) {
-            $response = $hook->prepare();
-        } else {
-            $response = $hook->execute();
-        }
+        $token = $hook->lock();
+
+        echo json_encode($token);
+
+        break;
+
+    case 'hook-execute':
+        $hook_id = filter('id');
+        $token = filter('token');
+        $hook = Hook::find($hook_id);
+
+        $response = $hook->execute($token);
+
+        echo json_encode($response);
+
+        break;
+
+    case 'hook-response':
+        $hook_id = filter('id');
+        $hook = Hook::find($hook_id);
+
+        $response = $hook->response();
 
         echo json_encode($response);
 
diff --git a/assets/src/js/functions/hooks.js b/assets/src/js/functions/hooks.js
index 2755ce922..23fa891b3 100644
--- a/assets/src/js/functions/hooks.js
+++ b/assets/src/js/functions/hooks.js
@@ -26,32 +26,65 @@ function startHooks() {
                     message: globals.translations.hookExecuting.replace('_NAME_', item.name)
                 });
 
-                executeHook(item, true);
+                startHook(item, true);
             });
         },
     });
 }
 
 /**
- * Esegue l'hook e lo visualizza.
- * Considerare l'utilizzo di localStorage per bloccare l'esecuzione locale multipla dell'hook nel caso di problemi.
+ * Richiama l'hook per l'esecuzione.
  *
  * @param hook
- * @param element_id
  */
-function executeHook(hook, init) {
+function startHook(hook, init) {
     $.ajax({
         url: globals.rootdir + "/ajax.php",
         type: "get",
         data: {
-            op: "hook",
+            op: "hook-lock",
             id: hook.id,
-            init: init,
+        },
+        success: function (data) {
+            var token = JSON.parse(data);
+
+            if (init) {
+                hookCount("#hooks-counter");
+
+                updateHook(hook);
+            }
+
+            if (token){
+                executeHook(hook, token);
+            } else {
+                var timeout = 10;
+
+                setTimeout(function () {
+                    startHook(hook);
+                }, timeout * 1000);
+            }
+        },
+    });
+}
+
+/**
+ * Richiama l'hook per l'esecuzione.
+ *
+ * @param hook
+ * @param token
+ */
+function executeHook(hook, token) {
+    $.ajax({
+        url: globals.rootdir + "/ajax.php",
+        type: "get",
+        data: {
+            op: "hook-execute",
+            id: hook.id,
+            token: token,
         },
         success: function (data) {
             var result = JSON.parse(data);
-
-            renderHook(hook, result);
+            updateHook(hook);
 
             var timeout;
             if (result.execute) {
@@ -61,12 +94,29 @@ function executeHook(hook, init) {
             }
 
             setTimeout(function () {
-                executeHook(hook);
+                startHook(hook);
             }, timeout * 1000);
+        },
+    });
+}
 
-            if (init) {
-                hookCount("#hooks-counter");
-            }
+/**
+ * Aggiorna le informazioni dell'hook.
+ *
+ * @param hook
+ * @param init
+ */
+function updateHook(hook) {
+    $.ajax({
+        url: globals.rootdir + "/ajax.php",
+        type: "get",
+        data: {
+            op: "hook-response",
+            id: hook.id,
+        },
+        success: function (data) {
+            var result = JSON.parse(data);
+            renderHook(hook, result);
 
             // Rimozione eventuale della rotella di caricamento
             var counter = $("#hooks-counter").text();
diff --git a/index.php b/index.php
index c66434b35..c73fcf1d6 100644
--- a/index.php
+++ b/index.php
@@ -14,7 +14,7 @@ switch ($op) {
         if ($dbo->isConnected() && $dbo->isInstalled() && auth()->attempt($username, $password)) {
             $_SESSION['keep_alive'] = true;
 
-            // Rimozione log vecchi
+        // Rimozione log vecchi
             //$dbo->query('DELETE FROM `zz_operations` WHERE DATE_ADD(`created_at`, INTERVAL 30*24*60*60 SECOND) <= NOW()');
         } else {
             $status = auth()->getCurrentStatus();
diff --git a/modules/aggiornamenti/src/UpdateHook.php b/modules/aggiornamenti/src/UpdateHook.php
index db3ac2362..cad88793a 100644
--- a/modules/aggiornamenti/src/UpdateHook.php
+++ b/modules/aggiornamenti/src/UpdateHook.php
@@ -18,8 +18,10 @@ class UpdateHook extends CachedManager
         return $result;
     }
 
-    public function response($update)
+    public function response()
     {
+        $update = self::getCache()['results'];
+
         $module = Modules::get('Aggiornamenti');
         $link = ROOTDIR.'/controller.php?id_module='.$module->id;
 
diff --git a/modules/backups/src/BackupHook.php b/modules/backups/src/BackupHook.php
index aa97a2562..3cdd7e916 100644
--- a/modules/backups/src/BackupHook.php
+++ b/modules/backups/src/BackupHook.php
@@ -7,6 +7,16 @@ use Hooks\Manager;
 
 class BackupHook extends Manager
 {
+    public function isSingleton()
+    {
+        return true;
+    }
+
+    public function needsExecution()
+    {
+        return setting('Backup automatico') && !Backup::isDailyComplete();
+    }
+
     public function execute()
     {
         $result = Backup::daily();
@@ -14,23 +24,15 @@ class BackupHook extends Manager
         return $result;
     }
 
-    public function response($data)
+    public function response()
     {
-        return [
-            'icon' => 'fa fa-file-o text-info',
-            'message' => tr('Backup completato!'),
-            'show' => true,
-        ];
-    }
-
-    public function prepare()
-    {
-        $result = setting('Backup automatico') && !Backup::isDailyComplete();
+        $show = boolval(setting('Backup automatico'));
+        $message = $show && !Backup::isDailyComplete() ? tr('Backup in corso...') : tr('Backup completato!');
 
         return [
-            'icon' => 'fa fa-file-o text-danger',
-            'message' => tr('Backup in corso...'),
-            'execute' => $result,
+            'icon' => 'fa fa-file-o text-success',
+            'message' => $message,
+            'show' => $show,
         ];
     }
 }
diff --git a/modules/emails/src/EmailHook.php b/modules/emails/src/EmailHook.php
index 3461e4b5b..e4697b188 100644
--- a/modules/emails/src/EmailHook.php
+++ b/modules/emails/src/EmailHook.php
@@ -7,6 +7,26 @@ use Notifications\EmailNotification;
 
 class EmailHook extends Manager
 {
+    public function isSingleton()
+    {
+        return true;
+    }
+
+    public function needsExecution()
+    {
+        $diff = date('Y-m-d', strtotime('-4 hours'));
+        $failed = function ($query) use ($diff) {
+            $query->whereDate('failed_at', '<', $diff)
+                ->orWhereNull('failed_at');
+        };
+
+        $remaining = Mail::whereNull('sent_at')
+            ->where($failed)
+            ->count();
+
+        return !empty($remaining);
+    }
+
     public function execute()
     {
         $accounts = Account::all();
@@ -36,25 +56,14 @@ class EmailHook extends Manager
             }
         }
 
-        return count($list);
+        return $list;
     }
 
-    public function response($data)
-    {
-        return $this->prepare();
-    }
-
-    public function prepare()
+    public function response()
     {
         $yesterday = date('Y-m-d', strtotime('-1 days'));
-        $diff = date('Y-m-d', strtotime('-4 hours'));
         $user = auth()->getUser();
 
-        $failed = function ($query) use ($diff) {
-            $query->whereDate('failed_at', '<', $diff)
-                ->orWhereNull('failed_at');
-        };
-
         $current = Mail::whereDate('sent_at', '>', $yesterday)
             ->where('created_by', $user->id)
             ->count();
@@ -63,17 +72,12 @@ class EmailHook extends Manager
             ->where('created_by', $user->id)
             ->count();
 
-        $remaining = Mail::whereNull('sent_at')
-            ->where($failed)
-            ->count();
-
-        $message = !empty($remaining) ? tr('Invio email in corso...') : tr('Invio email completato!');
+        $message = $total != $current ? tr('Invio email in corso...') : tr('Invio email completato!');
         $message = empty($total) ? tr('Nessuna email presente...') : $message;
 
         return [
             'icon' => 'fa fa-envelope text-info',
             'message' => $message,
-            'execute' => !empty($remaining),
             'show' => true,
             'progress' => [
                 'current' => $current,
diff --git a/plugins/importFE/src/InvoiceHook.php b/plugins/importFE/src/InvoiceHook.php
index a433eb810..8fb1f4366 100644
--- a/plugins/importFE/src/InvoiceHook.php
+++ b/plugins/importFE/src/InvoiceHook.php
@@ -14,8 +14,10 @@ class InvoiceHook extends CachedManager
         return $list;
     }
 
-    public function response($results)
+    public function response()
     {
+        $results = self::getCache()['results'];
+
         $count = count($results);
         $notify = false;
 
diff --git a/plugins/receiptFE/src/ReceiptHook.php b/plugins/receiptFE/src/ReceiptHook.php
index 96cc89812..fbee6a7a5 100644
--- a/plugins/receiptFE/src/ReceiptHook.php
+++ b/plugins/receiptFE/src/ReceiptHook.php
@@ -14,8 +14,10 @@ class ReceiptHook extends CachedManager
         return $list;
     }
 
-    public function response($results)
+    public function response()
     {
+        $results = self::getCache()['results'];
+
         $count = count($results);
         $notify = false;
 
diff --git a/src/Hooks/CachedManager.php b/src/Hooks/CachedManager.php
index a2b1762c4..fa90bce2e 100644
--- a/src/Hooks/CachedManager.php
+++ b/src/Hooks/CachedManager.php
@@ -12,13 +12,15 @@ abstract class CachedManager extends Manager
 
     abstract public function data();
 
+    public function needsExecution()
+    {
+        return !self::isCached();
+    }
+
     public function execute()
     {
         if (self::isCached()) {
             $results = self::getCache()['results'];
-
-            // Interpretazione della cache
-            $results = json_decode($results, true);
         } else {
             $results = $this->data();
 
@@ -35,6 +37,9 @@ abstract class CachedManager extends Manager
 
             $cache = database()->selectOne('zz_hook_cache', '*', ['hook_id' => $hook->id], ['id' => 'DESC']);
 
+            // Interpretazione della cache
+            $cache['results'] = json_decode($cache['results'], true);
+
             self::$cache = $cache;
         }
 
diff --git a/src/Hooks/Manager.php b/src/Hooks/Manager.php
index 635cc3451..7aa576ec3 100644
--- a/src/Hooks/Manager.php
+++ b/src/Hooks/Manager.php
@@ -16,35 +16,41 @@ abstract class Manager
     /**
      * Restituisce le informazioni per la visualizzazione dell'hook.
      *
-     * @param $results
-     *
      * @return array
      */
-    abstract public function response($results);
+    abstract public function response();
 
     /**
-     * Restituisce le informazioni per l'inizializzazione dell'hook.
+     * Restituisce se l'hook è un singletion, cioè deve essere richiamato solo da una istanza di navigazione.
      *
-     * @return array|null
+     * @return bool
      */
-    public function prepare()
+    public function isSingleton()
     {
-        return [
-            'execute' => true,
-        ];
+        return false;
     }
 
+    /**
+     * Restituisce se l'hook ha bisogno di una esecuzione;.
+     *
+     * @return bool
+     */
+    abstract public function needsExecution();
+
+    /**
+     * Gestisce la chiamata per l'esecuzione dell'hook.
+     *
+     * @return array|mixed
+     */
     public function manage()
     {
-        $prepare = $this->prepare();
-        if (empty($prepare['execute'])) {
+        if (!$this->needsExecution()) {
             return [];
         }
 
-        $data = $this->execute();
-        $results = $this->response($data);
+        $results = $this->execute();
 
-        return $results;
+        return [];
     }
 
     /**
diff --git a/src/Models/Hook.php b/src/Models/Hook.php
index e72c3eeff..ac6323d17 100644
--- a/src/Models/Hook.php
+++ b/src/Models/Hook.php
@@ -2,6 +2,8 @@
 
 namespace Models;
 
+use Carbon\Carbon;
+use Carbon\CarbonInterval;
 use Common\Model;
 use Hooks\Manager;
 use Illuminate\Database\Eloquent\Builder;
@@ -27,26 +29,103 @@ class Hook extends Model
         return $this->module ? $this->module->permission : 'rw';
     }
 
-    public function execute()
+    /**
+     * Restituisce le informazioni sull'esecuzione dell'hook.
+     *
+     * @return array
+     */
+    public function execute($token)
+    {
+        $hook = $this->getClass();
+
+        if ($hook->isSingleton() && $token != $this->processing_token) {
+            return;
+        }
+
+        $result = $hook->manage();
+
+        if ($hook->isSingleton()) {
+            $this->unlock($token);
+        }
+
+        $result['execute'] = $hook->needsExecution();
+
+        return $result;
+    }
+
+    /**
+     * Restituisce le informazioni per l'inizializzazione grafica dell'hook.
+     *
+     * @return array
+     */
+    public function response()
+    {
+        $hook = $this->getClass();
+
+        $response = $hook->response();
+
+        return $response;
+    }
+
+    /**
+     * Imposta il lock sull'hook se non già impostato.
+     * Timeout di 10 minuti.
+     *
+     * @return string|null
+     */
+    public function lock()
+    {
+        $hook = $this->getClass();
+        if (!$hook->isSingleton()) {
+            return true;
+        }
+
+        $result = empty($this->processing_at);
+
+        // Forzatura in caso di freeze per più di 10 minuti
+        $date = new Carbon($this->processing_at);
+        $interval = CarbonInterval::make('10 minutes');
+        $date = $date->add($interval);
+
+        $now = new Carbon();
+        $result |= $date->greaterThan($now);
+
+        $token = null;
+        if ($result) {
+            $token = random_string();
+
+            $this->processing_token = $token;
+            $this->processing_at = date('Y-m-d H:i:s');
+            $this->save();
+        }
+
+        return $token;
+    }
+
+    /**
+     * Rimuove il lock sull'hook.
+     *
+     * @return string|null
+     */
+    public function unlock($token)
+    {
+        if ($token == $this->processing_token) {
+            $this->processing_token = null;
+            $this->processing_at = null;
+            $this->save();
+        }
+    }
+
+    public function getClass()
     {
         $class = $this->class;
         $hook = new $class();
 
         if (!$hook instanceof Manager) {
-            return [
-                'show' => false,
-            ];
+            throw new \UnexpectedValueException();
         }
 
-        return $hook->manage();
-    }
-
-    public function prepare()
-    {
-        $class = $this->class;
-        $hook = new $class();
-
-        return $hook->prepare();
+        return $hook;
     }
 
     /* Relazioni Eloquent */
diff --git a/src/Notifications/EmailNotification.php b/src/Notifications/EmailNotification.php
index 427391958..f1a45c3fe 100644
--- a/src/Notifications/EmailNotification.php
+++ b/src/Notifications/EmailNotification.php
@@ -84,6 +84,12 @@ class EmailNotification extends PHPMailer implements NotificationInterface
     {
         $this->mail = $mail;
 
+        // Registazione della processazione
+        if (!empty($this->mail)) {
+            $this->mail->processing_at = date('Y-m-d H:i:s');
+            $this->mail->save();
+        }
+
         // Destinatari
         $receivers = $mail->receivers;
         foreach ($receivers as $receiver) {
@@ -91,7 +97,7 @@ class EmailNotification extends PHPMailer implements NotificationInterface
         }
 
         // Allegati
-        $uploads = $mail->attachments;
+        $uploads = $mail->uploads;
         foreach ($uploads as $upload) {
             $this->addUpload($upload);
         }
@@ -153,7 +159,7 @@ class EmailNotification extends PHPMailer implements NotificationInterface
                 $this->mail->failed_at = date('Y-m-d H:i:s');
             }
 
-            //$this->mail->save();
+            $this->mail->save();
         }
 
         $this->SmtpClose();