diff --git a/l10n_pt_stock_invoicexpress/models/stock_picking.py b/l10n_pt_stock_invoicexpress/models/stock_picking.py
index 21698ba2..5b08e3d2 100644
--- a/l10n_pt_stock_invoicexpress/models/stock_picking.py
+++ b/l10n_pt_stock_invoicexpress/models/stock_picking.py
@@ -103,8 +103,10 @@ def _compute_invoicexpress_doc_type(self):
 
     def _send_confirmation_email(self):
         # Only send Delivery emails if the InvoiceXpress checkbox is selected
-        to_send = self.filtered("invoicexpress_send_email")
-        super(StockPicking, to_send)._send_confirmation_email()
+        dont_send = self.filtered(
+            lambda x: x.can_invoicexpress and not x.invoicexpress_send_email
+        )
+        super(StockPicking, self - dont_send)._send_confirmation_email()
 
     @api.model
     def _get_invoicexpress_prefix(self, doctype):