There are some automated outgoing emails from my Drupal site like by core system mail, ubercart, webform and Rules.
The reason is that I also have a test site which is exactly the copy of the production site. And I would like to disable all the outgoing emails so that no mails will be sent from the testing one by mistake.
I have installed "phpmailer" "mime mail" "mail editor" modules.
Is there an out-of-box way to do this?