Re: [Asrg] Comments: draft-irtf-asrg-criteria-00.txt

["Walter Dnes" <waltdnes at waltdnes.org>]

On Thu, Jan 25, 2007 at 01:14:07AM -0500, Chris Lewis wrote

> The problem being that out of the 60,000 seats here, perhaps less than
> 10 of them are able to competently configure a set of rules like what
> you have.  Many of them don't even have a clear notion of the concept of
> "source IP" is, let alone being able to make reasonable choices of, say,

  In the case of a corporation, the end-user is *NOT* the customer; the
corporation (i.e. higher management) is the real customer.  At an ISP, I
outsource the POP and SMTP servers to the ISP, because it's too much
hassle for me to maintain patched, secure, servers, with big UPS,
failover, etc.  I chose to maintain my own mailfilters, with the ISP
maintaining the physical servers.  If 90% of customers choose to
outsource unwanted-email-blocking, that's their right.

> knowing why you'd want to block dynamic IPs or IPs in Korea.

  Because the computer guru in the next cubicle at work told me.<g>

> Furthermore, and with complete irony, I'll note that the only reason I
> read this thread is that my very own, personally trained, UA bayesian
> filtering flung it all in the junk folder! ;-)

  Bayesian filters belong in the junk folder.

> We're achieving effectiveness rates in excess of 98% with our "one set
> of rules" server based defences.  My personal account, which receives
> 400-600 emails/day, has 100 or more spams/day filtered out by the
> central server solution.  I usually go a week or so between spams that
> get past those central filters - I see _many_ more FPs with my bayesian
> than I see spam getting through.
> 
> My personally trained bayesian filtering has an absolutely abysmal
> track record.  On the spam aimed at the false positive handling
> address, which by design has _no_ filtering, Bayesian has an
> effectiveness rate of about 50%.  Yuck.  No amount of personal
> twiddling, custom rules, explicit pattern matching in my UA is going
> to make much difference to that.

  You seem to be mis-reading my message.  Nowhere did I praise Bayesian
filters.  I was talking about different users with different whitelists,
adding different DNSbls, blocking different countries and IP address
ranges.

-- 
Walter Dnes <waltdnes at waltdnes.org> In linux /sbin/init is Job #1

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