Turn of Mailfix info on user account pages when irrelevant

I have a site where some users have email accounts on the site's server, but most do not. Yet any user who viewsto his/her account page sees "Domain administrator right: No Domains." if that user does not have an account managed by Mailfix and does not have authority to maintain such accounts. Only a few people have such authority. For the bulk of users the Mailfix information is irrelevant and makes them ask the question: "what does this mean?"

It would be very nice if Mailfix tested to see whether a user has a mailbox it manages or the user has authority to administer mailboxes on the domain and display information only if one or both condition are true.

The fix appears to be in the following code at the end of the mailfix_admin.module. But I'm no php expert and couldn't figure out exactly what to do.

/**
 * Inject mailfix information when user's info is being displayed.
 *
 * @param object $account
 *    User object passed by reference.
 */
function mailfix_admin_view_user(&$account) {
  $access_level = mailfix_admin_get_access_level('view', $account);

  if ($access_level < MAILFIX_ADMIN_ACCESS_READONLY_ADMIN_FIELDS)
    return;

  $admin_for = mailfix_admin_get_current_dom_list($account, '');

  $account->content['mailfix']['admin_info'] = array(
    '#type' => 'user_profile_item',     // another core themable hook
    '#title' => 'Domain administration rights',
    '#weight' => 5,
    '#value' => $admin_for ? $admin_for : t('No domains.'),
    );
  
} // mailfix_admin_view_user

function mailfix_admin_create_user_block() {
  global $user;

  $domains = mailfix_admin_get_current_dom_list($user, '');

  // Can the current user create users?
  if ($domains == '' && !($user->uid == 1 || user_access('administer users')))
    return NULL;

  $block['subject'] = t('Mailfix Admin Create User');
  $block['content'] = drupal_get_form('mailfix_admin_create_user_form');
  return $block;
}

function mailfix_admin_block($op = 'list', $delta = 0, $edit = array()) {
  switch ($op) {
    case 'list':
      $blocks[0]['info'] = t('Mailfix Admin Create User');
      $blocks[0]['cache'] = BLOCK_CACHE_PER_USER;
      return $blocks;
    case 'view':
      switch ($delta) {
        case 0:
          return mailfix_admin_create_user_block();
          break; 
      }
      break;
  }
}