On 3/2/07, gep2(_at_)terabites(_dot_)com <gep2(_at_)terabites(_dot_)com> wrote:
As you know, in a recent thread I commented on what a
LOUSY solution IP-address-based blacklists are, in
general.
Yes, they are.
Part of the problem is that it is a VERY blunt instrument,
especially for companies which operate a large network
from behind a NAT router.
This is a normal and accepted method of operating a network for an
enterprise. I do not
believe this has any relevance in the argument of "good" vs. "bad", personally.
[ SNIP ]
All works well until about a week and a half ago, one of
their computers managed to get infected by some kind of
exploit (despite every machine in the company having and
running Symantec Antivirus software which is updated
daily). We found the problem within 24 hours and managed
to clean it all up, (hopefully!) but meanwhile at least
one or two E-mail blacklists (including XBL) flagged the
IP address of the company's router, and starting on the
21st some of their E-mails stopped getting delivered due
to the blacklisting. By Saturday, as more ISPs picked up
on the new list, E-fax (who processes and delivers their
fax-by-e-mail transmissions) suddenly started bouncing
even their outgoing fax attempts (even though their
systems had been clean, as best we can tell) for at least
two or three days already.
Businesses which count on reliable AND TIMELY e-mail
transmissions simply cannot have their E-mail
transmissions blocked "en masse" like this.
Email has never been reliable, and can't be counted on to be
timely. There are too many variables. You may have been having
"good luck", but that appears to have run out as far as business
process goes.
Your best bet is to create some better process around your
mission critical applications. I suspect you will be waiting a long time
for something else to happen.
-M<
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