diff --git a/src/Symfony/Component/Mime/Part/MessagePart.php b/src/Symfony/Component/Mime/Part/MessagePart.php
index 1b5c23e2bc411..00129b4757b40 100644
--- a/src/Symfony/Component/Mime/Part/MessagePart.php
+++ b/src/Symfony/Component/Mime/Part/MessagePart.php
@@ -59,4 +59,17 @@ public function bodyToIterable(): iterable
{
return $this->message->toIterable();
}
+
+ /**
+ * @return array
+ */
+ public function __sleep()
+ {
+ return ['message'];
+ }
+
+ public function __wakeup()
+ {
+ $this->__construct($this->message);
+ }
}
diff --git a/src/Symfony/Component/Mime/Tests/Part/MessagePartTest.php b/src/Symfony/Component/Mime/Tests/Part/MessagePartTest.php
index 2713d5bc079c7..c01958a4b94b8 100644
--- a/src/Symfony/Component/Mime/Tests/Part/MessagePartTest.php
+++ b/src/Symfony/Component/Mime/Tests/Part/MessagePartTest.php
@@ -39,4 +39,14 @@ public function testHeaders()
new ParameterizedHeader('Content-Disposition', 'attachment', ['name' => 'Subject.eml', 'filename' => 'Subject.eml'])
), $p->getPreparedHeaders());
}
+
+ public function testSerialize()
+ {
+ $email = (new Email())->from('fabien@symfony.com')->to('you@example.com')->text('content');
+ $email->getHeaders()->addIdHeader('Message-ID', $email->generateMessageId());
+
+ $p = new MessagePart($email);
+ $expected = clone $p;
+ $this->assertEquals($expected->toString(), unserialize(serialize($p))->toString());
+ }
}
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