skip action mailbox

config/application.rb

@@ -8,7 +8,7 @@ require "active_record/railtie"
 require "active_storage/engine"
 require "action_controller/railtie"
 require "action_mailer/railtie"
-require "action_mailbox/engine"
+# require "action_mailbox/engine"
 # require "action_text/engine"
 require "action_view/railtie"
 # require "action_cable/engine"