diff --git a/src/Message.php b/src/Message.php
index 0e6af11..b27fff1 100644
--- a/src/Message.php
+++ b/src/Message.php
@@ -31,7 +31,7 @@ public function __construct(
     public function __sleep(): array
     {
         // We don't want to serialize the parsed message.
-        return ['folder', 'uid', 'flags', 'headers', 'contents', 'size'];
+        return ['folder', 'uid', 'flags', 'head', 'body', 'size'];
     }
 
     /**
diff --git a/tests/Unit/MessageTest.php b/tests/Unit/MessageTest.php
index ed4b9d5..9832e8c 100644
--- a/tests/Unit/MessageTest.php
+++ b/tests/Unit/MessageTest.php
@@ -145,3 +145,35 @@
     // Different folder
     expect($message1->is($message4))->toBeFalse();
 });
+
+test('it serializes and unserializes the message correctly', function () {
+    $mailbox = Mailbox::make([
+        'username' => 'foo',
+        'password' => 'bar',
+    ]);
+
+    $mailbox->connect(ImapConnection::fake([
+        '* OK Welcome to IMAP',
+        'TAG1 OK Logged in',
+    ]));
+
+    $folder = new Folder($mailbox, 'INBOX', [], '/');
+
+    $originalMessage = new Message(
+        $folder,
+        123,
+        ['\\Seen', '\\Flagged'],
+        'From: test@example.com',
+        'This is the message body content',
+        1024
+    );
+
+    $serialized = serialize($originalMessage);
+    $unserializedMessage = unserialize($serialized);
+
+    expect($unserializedMessage->uid())->toBe(123);
+    expect($unserializedMessage->flags())->toBe(['\\Seen', '\\Flagged']);
+    expect($unserializedMessage->head())->toBe('From: test@example.com');
+    expect($unserializedMessage->body())->toBe('This is the message body content');
+    expect($unserializedMessage->size())->toBe(1024);
+});