php uses Pear's NetMail to send smtp emails

$params = array('host' => 'localhost',
 'port' => '25',
 'username' => 'test @jbxue.com',
 'password' => 'test');
 //$to = $test_mail;
 $recipients = $to; Recipient, can be an array To store multiple addresses
 $headers['From'] = $email;
 $headers['To'] = $to;
 $headers['Subject'] = $subject;
 $body = $message;
 //Select the smtp sending method, of course, mail() and sendmail are also supported
 $mail_object = &Mail::factory('smtp', $params);
 if (PEAR::isError($e = $mail_object->send($recipients, $headers, $body))) {
 die($e->getMessage() . "n");
 }
 ?>