diff --git a/config/environments/development.rb b/config/environments/development.rb
index fa779f52c..2b0f92cbc 100644
--- a/config/environments/development.rb
+++ b/config/environments/development.rb
@@ -91,7 +91,7 @@ Rails.application.configure do
     if ENV['HELO_ENABLED'] == 'enabled'
       config.action_mailer.delivery_method = :smtp
       config.action_mailer.smtp_settings = {
-        user_name: APPLICATION_NAME,
+        user_name: 'demarches-simplifiees',
         password: '',
         address: '127.0.0.1',
         domain: '127.0.0.1',