Enh: Added surpressed e-mail addresses configuration variable

protected/humhub/components/mail/Mailer.php

@@ -9,6 +9,7 @@
 namespace humhub\components\mail;
 
 use Yii;
+use yii\mail\MailEvent;
 
 /**
  * Mailer implements a mailer based on SwiftMailer.
@@ -25,6 +26,12 @@ class Mailer extends \yii\swiftmailer\Mailer
      */
     public $messageClass = 'humhub\components\mail\Message';
 
+    /**
+     * @var array of surpressed recipient e-mail addresses
+     * @since 1.3
+     */
+    public $surpressedRecipients = ['david.roberts@example.com', 'sara.schuster@example.com'];
+
     /**
      * Creates a new message instance and optionally composes its body content via view rendering.
      *
@@ -57,4 +64,48 @@ class Mailer extends \yii\swiftmailer\Mailer
         return $message;
     }
 
+
+    /**
+     * @inheritdoc
+     * @param Message $message
+     */
+    public function sendMessage($message)
+    {
+        // Remove example e-mails
+        $address = $message->getTo();
+
+        if (is_array($address)) {
+            foreach (array_keys($address) as $email) {
+                if ($this->isRecipientSurpressed($email)) {
+                    unset($address[$email]);
+                }
+            }
+            if (count($address) == 0) {
+                return true;
+            }
+            $message->setTo($address);
+        } elseif ($this->isRecipientSurpressed($address)) {
+            return true;
+        }
+
+        return parent::sendMessage($message);
+    }
+
+    /**
+     * Checks if an given e-mail address is surpressed.
+     *
+     * @since 1.3
+     * @param $email
+     * @return boolean is surpressed
+     */
+    public function isRecipientSurpressed($email)
+    {
+        if (in_array($email, $this->surpressedRecipients)) {
+            return true;
+        }
+
+        return false;
+    }
+
+
 }

protected/humhub/docs/CHANGELOG_DEV.md

@@ -46,3 +46,4 @@ HumHub Change Log - v1.3-dev Branch
 - Enh: Added UI core module to group UI components
 - Enh: Added new IconPicker form field
 - Chg: Moved form widgets from `humhub\widgets` to `humhub\modules\ui\form\widgets` (added compatibility layer)
+- Enh: Added surpressed e-mail addresses configuration variable