> I found this is a valid RR: > _spf.yandex.ru. 2768 IN TXT "v=spf1 > include:_spf-ipv4.yandex.ru include:_spf-ipv6.yandex.ru ~all" > But for A, CNAME, AAAA etc, the underline in hostname is invalid. > Does this make a confusion? no. next question. randy