diff --git a/src/Symfony/Component/Mime/RawMessage.php b/src/Symfony/Component/Mime/RawMessage.php
index ee3e2ab86f2cb..bf31239d240eb 100644
--- a/src/Symfony/Component/Mime/RawMessage.php
+++ b/src/Symfony/Component/Mime/RawMessage.php
@@ -21,7 +21,7 @@ class RawMessage
     private iterable|string|null $message = null;
     private bool $isGeneratorClosed;
 
-    public function __construct(iterable|string $message)
+    public function __construct(iterable|string|null $message)
     {
         $this->message = $message;
     }
diff --git a/src/Symfony/Component/Mime/Tests/EmailTest.php b/src/Symfony/Component/Mime/Tests/EmailTest.php
index 2e7d61ccf7eea..4695f5734e50b 100644
--- a/src/Symfony/Component/Mime/Tests/EmailTest.php
+++ b/src/Symfony/Component/Mime/Tests/EmailTest.php
@@ -24,6 +24,7 @@
 use Symfony\Component\Mime\Part\TextPart;
 use Symfony\Component\Mime\Test\Constraint\EmailHeaderSame;
 use Symfony\Component\PropertyInfo\Extractor\PhpDocExtractor;
+use Symfony\Component\PropertyInfo\Extractor\ReflectionExtractor;
 use Symfony\Component\Serializer\Encoder\JsonEncoder;
 use Symfony\Component\Serializer\Normalizer\ArrayDenormalizer;
 use Symfony\Component\Serializer\Normalizer\MimeMessageNormalizer;
@@ -591,6 +592,40 @@ public function testSymfonySerialize()
         $this->assertEquals($expected->getBody(), $n->getBody());
     }
 
+    public function testSymfonySerialize2()
+    {
+        $e = new Email();
+        $expected = clone $e;
+
+        $expectedJson = <<<EOF
+{
+    "text": null,
+    "textCharset": null,
+    "html": null,
+    "htmlCharset": null,
+    "attachments": [],
+    "headers": [],
+    "body": null,
+    "message": null
+}
+EOF;
+
+        $extractor = new ReflectionExtractor();
+        $propertyNormalizer = new PropertyNormalizer(null, null, $extractor);
+        $serializer = new Serializer([
+            new ArrayDenormalizer(),
+            new MimeMessageNormalizer($propertyNormalizer),
+            new ObjectNormalizer(null, null, null, $extractor),
+            $propertyNormalizer,
+        ], [new JsonEncoder()]);
+
+        $serialized = $serializer->serialize($e, 'json', [ObjectNormalizer::IGNORED_ATTRIBUTES => ['cachedBody']]);
+        $this->assertSame($expectedJson, json_encode(json_decode($serialized), \JSON_PRETTY_PRINT | \JSON_UNESCAPED_SLASHES));
+
+        $n = $serializer->deserialize($serialized, Email::class, 'json');
+        $this->assertEquals($expected, $n);
+    }
+
     public function testMissingHeaderDoesNotThrowError()
     {
         $this->expectException(ExpectationFailedException::class);