diff --git a/includes/mail.inc b/includes/mail.inc
index d2febed..409dd00 100644
@@ -509,7 +509,7 @@ function drupal_html_to_text($string, $allowed_tags = NULL) {
         $chunk = $casing($chunk);
       }
       // Format it and apply the current indentation.
-      $output .= drupal_wrap_mail($chunk, implode('', $indent));
+      $output .= drupal_wrap_mail($chunk, implode('', $indent)) . MAIL_LINE_ENDINGS;
       // Remove non-quotation markers from indentation.
       $indent = array_map('_drupal_html_to_text_clean', $indent);
     }