diff --git a/src/Responses/MessagePublishResponse.php b/src/Responses/MessagePublishResponse.php
index acde4af..c4725f4 100644
--- a/src/Responses/MessagePublishResponse.php
+++ b/src/Responses/MessagePublishResponse.php
@@ -15,7 +15,7 @@ public function __construct(
 
     public function isSuccessful(): bool
     {
-        return $this->statusCode === 200;
+        return $this->statusCode === 201;
     }
 
     public function getErrors(): array