diff --git a/inmail.services.yml b/inmail.services.yml
index 58583ca..4ef5986 100644
--- a/inmail.services.yml
+++ b/inmail.services.yml
@@ -1,7 +1,7 @@
 services:
   inmail.processor:
     class: Drupal\inmail\MessageProcessor
-    arguments: ['@entity.manager', '@plugin.manager.inmail.analyzer', '@plugin.manager.inmail.handler', '@logger.channel.inmail', '@inmail.mime_parser']
+    arguments: ['@entity.manager', '@plugin.manager.inmail.analyzer', '@plugin.manager.inmail.handler', '@logger.channel.inmail', '@inmail.mime_parser', '@account_switcher']
   plugin.manager.inmail.deliverer:
     class: Drupal\Core\Plugin\DefaultPluginManager
     arguments:
diff --git a/src/MessageProcessor.php b/src/MessageProcessor.php
index 1e09f1d..7a7bbde 100644
--- a/src/MessageProcessor.php
+++ b/src/MessageProcessor.php
@@ -9,9 +9,11 @@ namespace Drupal\inmail;
 use Drupal\Component\Utility\SafeMarkup;
 use Drupal\Core\Entity\EntityManagerInterface;
 use Drupal\Core\Logger\LoggerChannelInterface;
+use Drupal\Core\Session\AccountSwitcherInterface;
 use Drupal\inmail\Entity\DelivererConfig;
 use Drupal\inmail\MIME\ParseException;
 use Drupal\inmail\MIME\ParserInterface;
+use Drupal\user\Entity\User;
 
 /**
  * Mail message processor using services to analyze and handle messages.
@@ -65,15 +67,23 @@ class MessageProcessor implements MessageProcessorInterface {
   protected $parser;
 
   /**
+   * The account switcher service.
+   *
+   * @var \Drupal\Core\Session\AccountSwitcherInterface
+   */
+  protected $accountSwitcher;
+
+  /**
    * Constructs a new message processor.
    */
-  public function __construct(EntityManagerInterface $entity_manager, AnalyzerManagerInterface $analyzer_manager, HandlerManagerInterface $handler_manager, LoggerChannelInterface $logger_channel, ParserInterface $parser) {
+  public function __construct(EntityManagerInterface $entity_manager, AnalyzerManagerInterface $analyzer_manager, HandlerManagerInterface $handler_manager, LoggerChannelInterface $logger_channel, ParserInterface $parser, AccountSwitcherInterface $account_switcher) {
     $this->analyzerStorage = $entity_manager->getStorage('inmail_analyzer');
     $this->analyzerManager = $analyzer_manager;
     $this->handlerStorage = $entity_manager->getStorage('inmail_handler');
     $this->handlerManager = $handler_manager;
     $this->loggerChannel = $logger_channel;
     $this->parser = $parser;
+    $this->accountSwitcher = $account_switcher;
   }
 
   /**
@@ -114,6 +124,11 @@ class MessageProcessor implements MessageProcessorInterface {
       $event and $event->addArgument(get_class($analyzer_result), $analyzer_result->summarize());
     }
 
+    // Switch the user context.
+    // @todo: Replace anonymous user with the default user after
+    //    https://www.drupal.org/node/2754253 gets in.
+    $this->accountSwitcher->switchTo(User::getAnonymousUser());
+
     // Handle message.
     foreach ($this->handlerStorage->loadMultiple() as $handler_config) {
       /** @var \Drupal\inmail\Entity\HandlerConfig $handler_config */
@@ -124,6 +139,9 @@ class MessageProcessor implements MessageProcessorInterface {
       }
     }
 
+    // Switch back to a previous account.
+    $this->accountSwitcher->switchBack();
+
     if ($event) {
       // Dump all log items into a past argument per source.
       foreach ($result->readLog() as $source => $log) {