Disable email delivery on dev env

app/config/config_dev.yml

@@ -5,6 +5,9 @@ framework:
     router:   { resource: "%kernel.root_dir%/config/routing_dev.yml" }
     profiler: { only_exceptions: false }
 
+swiftmailer:
+    disable_delivery: true
+
 web_profiler:
     toolbar: true
     intercept_redirects: false