NEW Migrate from swiftmailer/swiftmailer to symfony/mailer

_config/mailer.yml

@@ -0,0 +1,34 @@
+---
+Name: mailer
+---
+SilverStripe\Core\Injector\Injector:
+  Symfony\Component\Mailer\MailerInterface:
+    class: Symfony\Component\Mailer\Mailer
+    constructor:
+      transport: '%$Symfony\Component\Mailer\Transport\TransportInterface'
+  Symfony\Component\EventDispatcher\EventDispatcherInterface.mailer:
+    class: Symfony\Component\EventDispatcher\EventDispatcher
+    calls:
+      - [addSubscriber, ['%$SilverStripe\Control\Email\MailerSubscriber']]
+---
+Name: mailer-dsn-default-config
+---
+SilverStripe\Core\Injector\Injector:
+  Symfony\Component\Mailer\Transport\TransportInterface:
+    factory: Symfony\Component\Mailer\Transport
+    factory_method: fromDsn
+    constructor:
+      dsn: 'sendmail://default'
+      dispatcher: '%$Symfony\Component\EventDispatcher\EventDispatcherInterface.mailer'
+---
+Name: mailer-dsn-env
+After:
+  - 'mailer-dsn-default-config'
+  - 'mailer-dsn-project-config'
+Only:
+  envvarset: MAILER_DSN
+---
+SilverStripe\Core\Injector\Injector:
+  Symfony\Component\Mailer\Transport\TransportInterface:
+    constructor:
+      dsn: '`MAILER_DSN`'

composer.json

@@ -37,10 +37,11 @@
         "silverstripe/assets": "^2",
         "silverstripe/vendor-plugin": "^2",
         "sminnee/callbacklist": "^0.1.1",
-        "swiftmailer/swiftmailer": "^6.3.0",
         "symfony/cache": "^6.1",
         "symfony/config": "^6.1",
         "symfony/filesystem": "^6.1",
+        "symfony/mailer": "^6.1",
+        "symfony/mime": "^6.1",
         "symfony/translation": "^6.1",
         "symfony/yaml": "^6.1",
         "ext-ctype": "*",
@@ -96,9 +97,6 @@
         },
         "files": [
             "src/includes/constants.php"
-        ],
-        "classmap": [
-            "thirdparty/swiftmailer"
         ]
     },
     "include-path": [