In message <CMM.0.90.4.922124959.brennan@watsol>, you wrote:
>I didn't have time yet to draw up a report to data.net.mx but we are
>rejecting their dialups as well...
If you are smart, you will reject _all_ direct connects to your SMTP port
from _all_ dialups, other than your own. If you get a direct connect to
your SMTP port from a dialup that is not your own, then it is probably
one having evil intent behind it, e.g. either spamming or mailbombing,
or subscription bombing, or the latest twist... harvesting of E-mail
addresses (for later spamming) direct from your SMTP server.
>I just saw internet.com.mx this morning. Their hostnames are not
>available through nslookup...
Try it again from another machine.
As far as I know, all of the internet.com.mx dialups _do_ have reverse
DNS, and they all fit the regular expression pattern:
-- Ron Guilmette, Roseville, California ---------- E-Scrub Technologies, Inc.
-- Deadbolt(tm) Personal E-Mail Filter demo: http://www.e-scrub.com/deadbolt/
-- Wpoison (web harvester poisoning) - demo: http://www.e-scrub.com/wpoison/
"Ping can be used offensively, and it's shipped with every windows CD"
-- Steve Atkins