How to set up PHP MAILER ?

[david-malaga]

Hello

I have php mailer, with this fields in php:
if (PHP_MAILER_SMTP) {
define("SMTP_SERVER", "xxxx");
define("SMTP_LOGIN", "xxxx");
define("SMTP_PASSWD", "xxxx");
}
What I have to write where x character is ?

And I would like to know too if can I use sendmail. If yes, I would like to know what's the path for sendmail.

Thanks in advance !