RE: OT: Why Friends Don't Let Friends use RBLs
- From: "Thomas W Shinder" <tshinder@xxxxxxxxxxx>
- To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
- Date: Wed, 2 Jun 2004 19:47:40 -0500
Hi Anthony,
But you do have false postives with RBLs. You block an entire server or
domain without performing due diligence. Critical mail may come from
that server and you're not even aware that you missed it because it was
blocked "en bloc".
Also, the RBL does nothing to reduce Internet bandwidth usage, because
the mail still arrives on your public link.
Thanks!
Tom
-----Original Message-----
From: Anthony Michaud [mailto:anthonym@xxxxxxxxxxxxxx]
Sent: Wednesday, June 02, 2004 7:35 PM
To: [ISAserver.org Discussion List]
Subject: [isalist] RE: OT: Why Friends Don't Let Friends use RBLs
http://www.ISAserver.org
Bayesian filtering is still to "iffy" for my liking. There is a greater
risk of "false positives" and the dynamic's of spam change frequently
enough to avoid filtering (for periods of time).
Finding a few good quality ORDB's has meant that I'm blocking ~35% of
all email's - spam still gets through, but its significantly lower and
there is no chance of a 'false positive'. To compensate for known
clients having a listing on one or more of the ORDB's, we white list all
known correspondence with a dump from the CRM product we use (automating
this is a 'to-do').
As we initiate new business, we send the first email, its in our
database (or should be if staff follow correct procedure) so its white
listed. Nothing important is blocked.
Show me a Bayesian filter with a proven track record of no false
positives and I may think about looking at it - but I probably won't -
the system I'm using ain't broke, so I'm not going to fix it :)
Anthony.
> -----Original Message-----
> From: Thomas W Shinder [mailto:tshinder@xxxxxxxxxxx]
> Sent: Thursday, 3 June 2004 10:16
> To: [ISAserver.org Discussion List]
> Subject: [isalist] RE: OT: Why Friends Don't Let Friends use RBLs
>
>
> http://www.ISAserver.org
>
> Hi Anthony,
>
> How does your use of an RBL on your network reduce overall bandwidth
> utilization on the Internet link? How are they superior to a good
> Bayesian filter?
>
> Thanks!
> Tom
>
> -----Original Message-----
> From: Anthony Michaud [mailto:anthonym@xxxxxxxxxxxxxx]
> Sent: Wednesday, June 02, 2004 7:11 PM
> To: [ISAserver.org Discussion List]
> Subject: [isalist] RE: OT: Why Friends Don't Let Friends use RBLs
>
> http://www.ISAserver.org
>
>
>
> > -----Original Message-----
> > From: Thomas W Shinder [mailto:tshinder@xxxxxxxxxxx]
> > Sent: Wednesday, 2 June 2004 11:22
> > To: [ISAserver.org Discussion List]
> > Subject: [isalist] OT: Why Friends Don't Let Friends use RBLs
>
> > ~~~~~~~~~~~ Clip from Fred Langa Newsletter ~~~~~~~~~~~~~~ Kennedy
> > Space Center Blacklisted I won't bore you with the rationale of why
> > broad-brush "blacklist" tools are bogus--- I've covered the
> inherent
> > flaws in this approach many times before. (
> http://langa.com/u/4v.htm
> > ) But I admit to a perverse pleasure in emails like this,
> which show
> > just how utterly stupid SPEWS, MAPS, SpamCop and the rest
> really are:
> >
> > Three times this year all of the e-mail from Kennedy Space
> Center was
> > blocked by our county's largest broadband ISP (RoadRunner).
> They have
> > done so because of a large quantity of mail coming from a
> single user
>
> > or because one or more of the following third party spam
>
> *snippage*
>
> I love these rants. Who I accept email from is *my* choice, based on
> the lattitude that I have been given in my role. If your company has
> sent unsolicited emails, I don't want 'em. If your ISP has done it,
> or a customer of the ISP's - the ISP needs to be contacted by you and
> the ISP fix it. I use dynamic RBL's, that have a quick turnaround on
> removal of blocks, so when your mail system is secure again, then you
> can talk to me. Don't fix it, then get on the phone or fax.
>
> Its *my* mailserver. Its *my* bandwidth. Its not free and the
> spammers / virus writers aren't paying for the bandwidth they waste.
>
> I just love those that think they have a god given right to send email
> - which is not the case.
>
> Anthony.
>
>
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