mailer.php

<?php

ini_set('display_errors', '0');
require_once "Mail.php";
require_once "Mail/mime.php";
require_once 'config.inc.php'; # you can define constants in this file. 

class Mailer {

	var $_headers = array();

	public function __construct($subject) {
		$this->_headers = array('From' => FROM_EMAIL,
			'To' => implode(TO_EMAIL, ','),
			'Subject' => $subject,
			'MIME-Version' => 1,
			'Content-type' => 'text/html;charset=iso-8859-1'
		);
	}

	public function send_mail($body) {
		$smtp = Mail::factory('smtp',
		array ('host' => HOST,
			'auth' => 'plain',
			'port' => PORT,
			'username' => USERNAME,
			'password' => PASSWORD));
		$mail = $smtp->send(implode(TO_EMAIL, ','), $this->_headers, $body);
		if (PEAR::isError($mail)) {
			return false;
		} else {
			return true;
		}
	}
}

?>