the answer is in:
/woocommerce/emails/email-order-items.php
// Variation
if ( $item_meta->meta ) {
echo ‘
<small>’ . nl2br( $item_meta->display( true, true ) ) . ‘</small>’;
}
it should be changed to:
// Variation
if ( $item_meta->meta ) {
echo ‘
<small>’ . nl2br( $_product->get_attribute( ‘delivery’ ) ) . ‘</small>’;
}
BUT
I dont know names of used attributes (above is ‘delivery’). Where I can find it?