diff --git a/src/Symfony/Bridge/Twig/Mime/TemplatedEmail.php b/src/Symfony/Bridge/Twig/Mime/TemplatedEmail.php
index 14fb14c0a211a..d840e268c4847 100644
--- a/src/Symfony/Bridge/Twig/Mime/TemplatedEmail.php
+++ b/src/Symfony/Bridge/Twig/Mime/TemplatedEmail.php
@@ -84,4 +84,22 @@ public function getContext(): array
     {
         return $this->context;
     }
+
+    /**
+     * @internal
+     */
+    public function __serialize(): array
+    {
+        return [$this->template, $this->htmlTemplate, $this->textTemplate, $this->context, parent::__serialize()];
+    }
+
+    /**
+     * @internal
+     */
+    public function __unserialize(array $data): void
+    {
+        [$this->template, $this->htmlTemplate, $this->textTemplate, $this->context, $parentData] = $data;
+
+        parent::__unserialize($parentData);
+    }
 }
diff --git a/src/Symfony/Bridge/Twig/Tests/Mime/TemplatedEmailTest.php b/src/Symfony/Bridge/Twig/Tests/Mime/TemplatedEmailTest.php
index 8dab46a4c31f2..f5d9235a6d503 100644
--- a/src/Symfony/Bridge/Twig/Tests/Mime/TemplatedEmailTest.php
+++ b/src/Symfony/Bridge/Twig/Tests/Mime/TemplatedEmailTest.php
@@ -22,4 +22,18 @@ public function test()
         $email->htmlTemplate($template = 'html');
         $this->assertEquals($template, $email->getHtmlTemplate());
     }
+
+    public function testSerialize()
+    {
+        $email = (new TemplatedEmail())
+            ->textTemplate('text.txt.twig')
+            ->htmlTemplate('text.html.twig')
+            ->context($context = ['a' => 'b'])
+        ;
+
+        $email = unserialize(serialize($email));
+        $this->assertEquals('text.txt.twig', $email->getTextTemplate());
+        $this->assertEquals('text.html.twig', $email->getHtmlTemplate());
+        $this->assertEquals($context, $email->getContext());
+    }
 }
diff --git a/src/Symfony/Component/Mime/Email.php b/src/Symfony/Component/Mime/Email.php
index 5a1e57aa6746f..7812372d5372f 100644
--- a/src/Symfony/Component/Mime/Email.php
+++ b/src/Symfony/Component/Mime/Email.php
@@ -543,20 +543,11 @@ private function setListAddressHeaderBody($name, array $addresses)
         return $this;
     }
 
-    public function __sleep()
+    /**
+     * @internal
+     */
+    public function __serialize(): array
     {
-        $this->_headers = $this->getHeaders();
-        $this->_raw = false;
-
-        if (null !== $body = parent::getBody()) {
-            $r = new \ReflectionProperty(Message::class, 'body');
-            $r->setAccessible(true);
-            $this->_body = $r->getValue($this);
-            $this->_raw = true;
-
-            return ['_raw', '_headers', '_body'];
-        }
-
         if (\is_resource($this->text)) {
             if (stream_get_meta_data($this->text)['seekable'] ?? false) {
                 rewind($this->text);
@@ -583,22 +574,16 @@ public function __sleep()
             }
         }
 
-        return ['_raw', '_headers', 'text', 'textCharset', 'html', 'htmlCharset', 'attachments'];
+        return [$this->text, $this->textCharset, $this->html, $this->htmlCharset, $this->attachments, parent::__serialize()];
     }
 
-    public function __wakeup()
+    /**
+     * @internal
+     */
+    public function __unserialize(array $data): void
     {
-        $r = new \ReflectionProperty(Message::class, 'headers');
-        $r->setAccessible(true);
-        $r->setValue($this, $this->_headers);
-        unset($this->_headers);
+        [$this->text, $this->textCharset, $this->html, $this->htmlCharset, $this->attachments, $parentData] = $data;
 
-        if ($this->_raw) {
-            $r = new \ReflectionProperty(Message::class, 'body');
-            $r->setAccessible(true);
-            $r->setValue($this, $this->_body);
-            unset($this->_body);
-        }
-        unset($this->_raw);
+        parent::__unserialize($parentData);
     }
 }
diff --git a/src/Symfony/Component/Mime/Message.php b/src/Symfony/Component/Mime/Message.php
index 43b5fe40c911a..db6e13fae6a4d 100644
--- a/src/Symfony/Component/Mime/Message.php
+++ b/src/Symfony/Component/Mime/Message.php
@@ -129,4 +129,20 @@ private function generateMessageId(string $email): string
     {
         return bin2hex(random_bytes(16)).strstr($email, '@');
     }
+
+    /**
+     * @internal
+     */
+    public function __serialize(): array
+    {
+        return [$this->headers, $this->body];
+    }
+
+    /**
+     * @internal
+     */
+    public function __unserialize(array $data): void
+    {
+        [$this->headers, $this->body] = $data;
+    }
 }
diff --git a/src/Symfony/Component/Mime/RawMessage.php b/src/Symfony/Component/Mime/RawMessage.php
index 790c7eea5351c..16b090c95474e 100644
--- a/src/Symfony/Component/Mime/RawMessage.php
+++ b/src/Symfony/Component/Mime/RawMessage.php
@@ -16,7 +16,7 @@
  *
  * @experimental in 4.3
  */
-class RawMessage
+class RawMessage implements \Serializable
 {
     private $message;
 
@@ -52,4 +52,36 @@ public function toIterable(): iterable
         }
         $this->message = $message;
     }
+
+    /**
+     * @internal
+     */
+    final public function serialize()
+    {
+        return serialize($this->__serialize());
+    }
+
+    /**
+     * @internal
+     */
+    final public function unserialize($serialized)
+    {
+        $this->__unserialize(unserialize($serialized));
+    }
+
+    /**
+     * @internal
+     */
+    public function __serialize(): array
+    {
+        return [$this->message];
+    }
+
+    /**
+     * @internal
+     */
+    public function __unserialize(array $data): void
+    {
+        [$this->message] = $data;
+    }
 }