aqui un ejemplo de como se usa la funcion mail espero que te sirva
<?php
$body="<em>HTML</em> formatted <strong>Message</strong";
$headers = "From:
[email protected] \r\n";
$headers.= "Content-Type: text/html; charset=ISO-8859-1 ";
$headers .= "MIME-Version: 1.0 ";
/*notice there aren't any \r\n after the second two header additions. This is what made this version work correctly*/
mail("
[email protected]", "An HTML Message", $body, $headers);
?>
tambien mira aqui el manual
http://www.php.net/manual/es/ref.mail.php