Mail won't send... Cookies won't set

[Sharif]

I don't understand why uisng the mail() function, NO mail will send from this stupid server.

php_info() for it is used at: PHPINFO

I was testing mail() and did this but nothing happened

mail('[e-mail]', 's','k');

Tried to set cookies but ntohing happened:

setcookie("5", $_POST['5'], time()+604800, '', $cookie_domain);

[Sharif]

Some additional questions, when using the mail() function, can I use variables that are set in a page I include on the page I use the mail function on? Also, do single or double quotes matter?