diff --git a/.env b/.env
index 6172586..b5a3632 100644
--- a/.env
+++ b/.env
@@ -32,6 +32,7 @@ DATABASE_URL="sqlite:///%kernel.project_dir%/var/data.db"
 # For a generic SMTP server, use: "smtp://localhost:25?encryption=&auth_mode="
 # Delivery is disabled by default via "null://localhost"
 MAILER_URL=null://localhost
+MAILER_SENDER=system@localhost
 ###< symfony/swiftmailer-bundle ###
 
 ASSET_BASE_URL=null