diff --git a/elections/utils.py b/elections/utils.py
index 27dfc97..fd2c572 100644
--- a/elections/utils.py
+++ b/elections/utils.py
@@ -421,6 +421,8 @@ def send_mail(election, subject, body, reply_to):
                     ),
                     to=[v.email],
                     reply_to=[reply_to],
+                    # On modifie l'adresse de retour d'erreur
+                    headers={"Return-Path": reply_to},
                 ),
                 v,
             )