edlp_d8/sites/all/modules/contrib/mail/maillog/maillog.module

<?php

/**
 * @file
 * Utility to log all Mails for debugging purposes.
 */

use Drupal\Core\Routing\RouteMatchInterface;

/**
 * Implements hook_help().
 */
function maillog_help($route_name, RouteMatchInterface $route_match) {
  switch ($route_name) {
    case 'help.page.maillog':
      $output = '';
      $output .= '<h3>' . t('About') . '</h3>';
      $output .= '<p>' . t('Maillog module provides an opportunity to save the mail log for debugging purposes.') . '</p>';
      $output .= '<h3>' . t('Uses') . '</h3>';
      $output .= '<dl>';
      $output .= '<dt>' . t('Saves the mail log') . '</dt>';
      $output .= '<dt>' . t('View integration') . '</dt>';
      $output .= '<dt>' . t('Displays verbose output of the mail for users with permission "view maillog"') . '</dt>';
      $output .= '<dt>' . t('Suppress email delivery') . '</dt>';
      $output .= '</dl>';
      return $output;
  }
}