From: Markus Ernst on
James Collins schrieb:
> Hi Markus,
> Which operating system are you running your PHP code from?
> According to, the function
> might not exist if you're using Windows.
> I do not have any specific experience with the checkEmail() or checkdnsrr()
> functions, but I have successfully used PEAR's NET_DNS package (
> for querying DNS records on both
> windows and linux servers.

No, it is on a Linux system; the function usually returns correct
results, also for addresses on a sub domain. I have been using it for
years, and the problem only occurs with this special address. That makes
me think it is due to a quite special configuration of the systems this
address points to.