Remove MimeMessageNormalizer if the Mime component is not installed

Author: wouterj

DependencyInjection/FrameworkExtension.php

@@ -1505,6 +1505,10 @@ private function registerSerializerConfiguration(array $config, ContainerBuilder
             $container->removeDefinition('serializer.denormalizer.unwrapping');
         }
 
+        if (!class_exists(Headers::class)) {
+            $container->removeDefinition('serializer.normalizer.mime_message');
+        }
+
         $serializerLoaders = [];
         if (isset($config['enable_annotations']) && $config['enable_annotations']) {
             if (!$this->annotationsConfigEnabled) {

composer.json

@@ -83,7 +83,7 @@
         "symfony/messenger": "<4.4",
         "symfony/mime": "<4.4",
         "symfony/property-info": "<4.4",
-        "symfony/serializer": "<4.4",
+        "symfony/serializer": "<5.2",
         "symfony/stopwatch": "<4.4",
         "symfony/translation": "<5.0",
         "symfony/twig-bridge": "<4.4",