<p dir="ltr"><a href="http://domainkeys.sourceforge.net/underscore.html">http://domainkeys.sourceforge.net/underscore.html</a></p>
<div class="gmail_quote">On 29 May 2014 10:28, "hua peng" <<a href="mailto:huapeng@arcor.de">huapeng@arcor.de</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
I found this is a valid RR:<br>
<br>
_<a href="http://spf.yandex.ru" target="_blank">spf.yandex.ru</a>.         2768    IN      TXT     "v=spf1<br>
include:_<a href="http://spf-ipv4.yandex.ru" target="_blank">spf-ipv4.yandex.ru</a> include:_<a href="http://spf-ipv6.yandex.ru" target="_blank">spf-ipv6.yandex.ru</a> ~all"<br>
<br>
<br>
But for A, CNAME, AAAA etc, the underline in hostname is invalid.<br>
Does this make a confusion?<br>
<br>
Thanks.<br>
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</blockquote></div>