Best way of setting a global email recipient

[eluser]Référencement Google[/eluser]
The user guide says this:

Setting Email Preferences in a Config File

If you prefer not to set preferences using the above method, you can instead put them into a config file. Simply create a new file called the email.php, add the $config array in that file. Then save the file at config/email.php and it will be used automatically. You will NOT need to use the $this->email->initialize() function if you save your preferences in a config file.

Have you tried it exactly like it is explained?