[15129] in cryptography@c2.net mail archive
What's wrong with Victor's approach to spam
daemon@ATHENA.MIT.EDU (John Gilmore)
Fri Jan 2 12:03:27 2004
X-Original-To: cryptography@metzdowd.com
X-Original-To: cryptography@metzdowd.com
To: cryptography@metzdowd.com, gnu@new.toad.com
Date: Thu, 01 Jan 2004 19:09:22 -0800
From: John Gilmore <gnu@toad.com>
Victor.Duchovni@morganstanley.com wrote:
> Of the ~750000 messages inbound message recipients a day on the gateways I
> manage, 40% are rejected by RBL lists and private blacklists/content
> checks. 5% of the remainder is caught as spam by a commercial anti-spam
> content filter. The filter's detection rate against this RBL pre-screened
> sample is ~90%, the false positive rate is less than 0.01%. So we get rid
> of ~99.5% of spam with no hash-cash. This is good enough. I am not about
> to implement any CPU burning stamp generators any time soon.
Somehow, my personal emails are always part of that "false positive
rate" among self-satisfied anti-spammers like Victor.
Luckily I resisted the barrage of unsolicited phone calls from Morgan
Stanley, seeking to get my investment business. So I don't have to
worry about Victor censoring the email from me to my broker. But I'm
curious: do the 'false positives' that result in a loss to a Morgan
Stanley customer get made whole out of Victor's paycheck?
John
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----- Transcript of session follows -----
... while talking to mx2.morganstanley.com.:
>>> DATA
<<< 554 Service unavailable; [209.237.225.253] blocked using dnsbl.ms.com, reason: http://dsbl.org/listing?ip=209.237.225.253
554 5.0.0 Service unavailable
<<< 554 Error: no valid recipients
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To: Victor.Duchovni@morganstanley.com, gnu@toad.com
Subject: Re: why "penny black" etc. are not very useful
In-reply-to: <Pine.LNX.4.58.200312311428390.8740@piias302.ms.com>
Date: Wed, 31 Dec 2003 14:51:55 -0800
From: John Gilmore <gnu@toad.com>
Just checking whether your super effective "spam filters" allow me to
respond to the message that you sent to cryptography@metzdowd.com.
John Gilmore
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