[Mailer] added message events logger

Author: fabpot

DependencyInjection/FrameworkExtension.php

@@ -553,6 +553,10 @@ private function registerProfilerConfiguration(array $config, ContainerBuilder $
             $loader->load('messenger_debug.xml');
         }
 
+        if (class_exists(Mailer::class)) {
+            $loader->load('mailer_debug.xml');
+        }
+
         $container->setParameter('profiler_listener.only_exceptions', $config['only_exceptions']);
         $container->setParameter('profiler_listener.only_master_requests', $config['only_master_requests']);
 

Resources/config/mailer_debug.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+
+<container xmlns="http://symfony.com/schema/dic/services"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://symfony.com/schema/dic/services http://symfony.com/schema/dic/services/services-1.0.xsd">
+
+    <services>
+        <service id="mailer.logger_message_listener" class="Symfony\Component\Mailer\EventListener\MessageLoggerListener">
+            <tag name="kernel.event_subscriber"/>
+        </service>
+    </services>
+</container>