Big slowdown

You can choose in the global Parameters between :
- Library PHPMailer
- Function PHPMail
- Connexion throught Socket

- Library PHPMailer
=> uses de widely spread PHPMailer library, able to connect to smtp server with or without authentication, over ssl or not
=> it is the advised selection

- Function PHP Mail
=> uses the mail function included in PHP. It is a low level function that has limitation (cannot connect with authentication without ssl)

- Connexion throught Socket
=> implements a direct connection to the smtp server using Socket. It is a very low level way to do, that will not be allowed by all smtp servers.