diff --git a/Message/Mail/MailHandler.php b/Message/Mail/MailHandler.php
index c11dc55a9..5558f4873 100755
--- a/Message/Mail/MailHandler.php
+++ b/Message/Mail/MailHandler.php
@@ -170,7 +170,7 @@ class MailHandler
      * @var string
      * @since 1.0.0
      */
-    public string $dsn = DsnNotificationLevel:NONE;
+    public string $dsn = DsnNotificationType::NONE;
 
     /**
      * Keep connection alive.
diff --git a/Message/Mail/Smtp.php b/Message/Mail/Smtp.php
index d92195942..1d84830b9 100755
--- a/Message/Mail/Smtp.php
+++ b/Message/Mail/Smtp.php
@@ -609,7 +609,7 @@ class Smtp
      *
      * @since 1.0.0
      */
-    public function recipient(string $address, string $dsn = DsnNotificationLevel:NONE) : bool
+    public function recipient(string $address, string $dsn = DsnNotificationType::NONE) : bool
     {
         if ($dsn === '') {
             $rcpt = 'RCPT TO:<' . $address . '>';