Arrogant RBL list maintainers

William Herrin herrin-nanog at
Wed Dec 9 10:57:29 CST 2009

On Wed, Dec 9, 2009 at 10:18 AM, Sven Olaf Kamphuis
<sven at> wrote:
> We've noticed that Trend Micro "" just "assumes" ips are
> dynamic by default,
> because they just assume that working, rfc compliant, reverse dns that
> just-so-happens to be automatically generated would indicate dynamic ip
> space.


Which is it? By default or because it looks automatically generated?

By default would seem to be a problem. Automatically generated, not so much.

If you haven't made the effort to set up and secure a mail server then
you shouldn't be talking smtp to the hosts is used to
protect. If you haven't bothered to set the reverse DNS to match your
server's name then you haven't made the effort, at least not with a
modicum of competence.

Bill Herrin

William D. Herrin ................ herrin at  bill at
3005 Crane Dr. ...................... Web: <>
Falls Church, VA 22042-3004

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