Ticket #32563: 32563.patch

wp-includes/user.php

@@ -2434 +2434 @@
 
         update_user_option( $user_id, 'default_password_nag', true, true ); //Set up the Password change nag.
 
-        wp_new_user_notification( $user_id, $user_pass );
+        if ( apply_filters( 'send_new_user_notification', true, $user_id ) )
+                wp_new_user_notification( $user_id, $user_pass );
 
         return $user_id;
 }