materio-base-d7/sites/all/modules/contrib/mail/smtp/smtp.module

<?php

/**
 * @file
 * Enables Drupal to send e-mail directly to an SMTP server.
 *
 * This module uses a customized extract of the PHPMailer
 * library (originally by Brent R. Matzelle, now maintained
 *  by Codeworx Tech.) relicensed from LGPL to GPL, included
 * as a part of the module.
 *
 * Overriding mail handling in Drupal to make SMTP the default
 * transport layer, requires to change the mail_system variable's
 * default value array('default-system' => 'DefaultMailSystem').
 * This module uses array('default-system' => 'SmtpMailSystem').
 */

/**
 * Implements hook_help().
 */
function smtp_help($path, $arg) {
  switch ($path) {
    case 'admin/help#smtp':
      return t('Allow for site emails to be sent through an SMTP server of your choice.');
  }
}

/**
 * Implements hook_menu().
 */
function smtp_menu() {
  $items['admin/config/system/smtp'] = array(
    'title'            => 'SMTP Authentication Support',
    'page callback'    => 'drupal_get_form',
    'page arguments'   => array('smtp_admin_settings'),
    'access arguments' => array('administer smtp module'),
    'description'      => 'Allow for site emails to be sent through an SMTP server of your choice.',
    'file'             => 'smtp.admin.inc',
  );
  return $items;
}

/**
 * Implements hook_permission().
 */
function smtp_permission() {
  return array(
    'administer smtp module' => array(
      'title' => t('Administer SMTP Authentication Support module'),
      'description' => t('Perform administration tasks for SMTP Authentication Support module.'))
  );
}


/**
 * Implements hook_mail().
 */
function smtp_mail($key, &$message, $params) {
  if ($key == 'smtp-test') {
    $message['subject'] = $params['subject'];
    $message['body'] = $params['body'];
  }
}