diff --git a/roles/app-setup/templates/app-settings-base.j2 b/roles/app-setup/templates/app-settings-base.j2
index 5c537fc..72a3232 100644
--- a/roles/app-setup/templates/app-settings-base.j2
+++ b/roles/app-setup/templates/app-settings-base.j2
@@ -50,6 +50,10 @@ LOGGING = {
 
 DEBUG = True
 
+# https://docs.djangoproject.com/fr/2.2/topics/email/#file-backend
+EMAIL_BACKEND = 'django.core.mail.backends.filebased.EmailBackend'
+EMAIL_FILE_PATH = '/tmp/publik-devinst-mails'  # will be auto-created
+
 {% block app_custom_after %}{% endblock %}
 
 for filename in sorted(