ORBS (Re: Scanning)

["E.B. Dreger" <eddy+public+spam () noc everquick net>]

> Date: Sun, 27 May 2001 02:02:24 -0400 (EDT)
> From: Greg A. Woods <woods () weird com>

> > But, ORBS remains indefensible.

> It would seem that I have no problems either defending it, or using it.

ORBS catches far more than MAPS.  My take is that anybody who has a
problem with the infrequent ORBS probes should have a huge problem with
the daily bombardment of relay attempts.

Besides, whoever said that one must use ORBS "out of the box"?  I maintain
a whitelist of IP addresses to override ORBS.  As much as I'd like to see
Earthlink get a clue, MSN close their relays (have they yet?), and
RoadRunner cooperate, I allow their MXes through when I find them.

Modern spammers have gotten nasty.  They use hundreds of different relays,
each time changing the source address:

        a57e6s () t8iji7 somedomain tld
        in46hi () diief4 anotherdomain tld
        xkm8ey () ithi62 yetanotherdomain tld

with * DNS so that all subdomains resolve, and the subject:

        I have no respect for netiquette!!!!!      [i35ed7]
        I have no respect for netiquette!!!!!      [ed8ooe]
        I have no respect for netiquette!!!!!      [h8qi2h]

So as to throw off MXes that look for the same message again and again.
I suppose that scanning the body and looking for repetition is possible,
but it's only a matter of time until _that_ get perturbed in 100 different
fashions.

Bottom line:  Blocking mail from rogue servers is the best way to stop
spam and to not be a party to somebody else getting relay-raped.  Anyone
with clue closed relays how many years ago?

I don't buy the "we need open relay for nationwide users" argument,
either.  Build a cheap MX that does nothing but take mail from a given
POP, and send it to the world.  Anti-spoofing at the border, don't accept
mail from the outside world, and you're done.


Eddy

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