>I'm curious about that myself. Doing a reverse against our DNS servers for
>our 209.15.194.101 and .112 mailservers returns the correct PTR entry.
>Against other servers sometimes fails. So I suppose it has to do with
>getting our colo facilities nameservers on board if they're considered
>authoritative.
Actually, I just checked here and at www.samspade.org and it looks like
neither have a reverse DNS entry. I think you may be right that they added
it to their DNS servers (which would explain why you get the PTR results),
but that they aren't authoritative.
-Scott
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