diff --git a/app/Http/Controllers/MailController.php b/app/Http/Controllers/MailController.php
index 471ed9f..0fac348 100644
--- a/app/Http/Controllers/MailController.php
+++ b/app/Http/Controllers/MailController.php
@@ -139,7 +139,7 @@ public function put(Request $request)
         $mail->body          = $body;
         $mail->from_addr     = $from_addr;
         $mail->from_protocol = $from_protocol;
-        $mail->received_at   = $received_at;
+        $mail->received_at   = Carbon::parse($received_at);
         $mail->save();
 
         return response()->json([