Hebrew subject have two =?UTF-8?B? and not sent

I discovered that the title is too long and it seperate it. I'm not an expert so I don't understand why it is not sent, but I wrote a validation, when editing node to throw an error, when the title is long.

function custom_module_nodeapi(&$node, $op, $teaser, $page) {
  global $user;
  // Operate only on node types set in 'simplenews_content_types' variable.
  if (!in_array($node->type, variable_get('simplenews_content_types', array('simplenews')))) {
    return;
  }
  switch ($op) {
    case 'validate':

        // Build email subject as simplenews
        if ($tid = $node->simplenews['tid']) {
          $term = taxonomy_get_term($tid);
          // Translate the newsletter term name if simplenews vocabulary uses Localized terms.
          if (module_exists('i18ntaxonomy') && i18ntaxonomy_vocabulary(variable_get('simplenews_vid', '')) == I18N_TAXONOMY_LOCALIZE) {
            $name = tt('taxonomy:term:'. $tid .':name', $term->name, $langcode);
          }
          else {
            $name = $term->name;
          }
        }
        else {
          $name = t('Unassigned newsletter');
        }
        $string = theme('simplenews_newsletter_subject', $name, $node->title,$langcode);
        /* According to encoding in unicode.inc I check if this will be long or not */
        if (preg_match('/[^\x20-\x7E]/', $string)) {
            $chunk_size = 47; // floor((75 - strlen("=?UTF-8?B??=")) * 0.75);
            $len = strlen($string);
            $chunk = drupal_truncate_bytes($string, $chunk_size);
            if ($len > strlen($chunk)) {
                  form_set_error('title', t('Title is too long, please reduce the size.' ));
            }
        }
      break;
  }
}