Send a simple mail from Drupal 6 using drupal_mail hook

druapl_6_mail_send.php

<?php
drupal_mail( 'control_centre_feed', 'feed', '[email protected]', language_default(), $params, '[email protected]');

function control_centre_feed_mail ($key, &$message, $params) {
  switch ($key) {
    case 'feed':
      $message['subject'] = t($params['filename']);
      $message['body'][] = t($params['filepath']);
      break;
  }
  drupal_set_message( $params['filename'] );
  drupal_set_message( 'Email sent to:' . $message['to'] . '' );
}
?>