full-disclosure - Spam with PGP

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From: mbassett at omaha.com (Bassett, Mark)
Subject: Spam with PGP

Using free tool K9.  I haven't had to change one from spam to not spam
in at least a couple weeks.  Does a great job, and super easy to set up.
http://www.keir.net/k9.html

Column 1: Since Sun Apr 20 2003  12:00:00 AM (172 days)
Column 2: Since Sun Apr 20 2003  12:00:00 AM (172 days)

Total number of emails processed                               268
Number of Good emails processed                                 73
Number of Spam emails processed                                195
Percentage of emails that matched whitelist rules             0.0%
Percentage of emails that matched blacklist rules             0.0%
Number of emails re-classified to Good                          15
Number of emails re-classified to Spam                          12
Percentage emails misidentified as Spam (false positives)     5.6%
Percentage emails misidentified as Good (false negatives)     4.5%
Overall accuracy                                             89.9%

Mark Bassett
Network Administrator
World media company
Omaha.com
402-898-2079

-----Original Message-----
From: Jonathan A. Zdziarski [mailto:jonathan@...learelephant.com] 
Sent: Wednesday, October 08, 2003 11:24 AM
To: Michael D Schleif
Cc: full-disclosure@...ts.netsys.com
Subject: Re: [Full-Disclosure] Spam with PGP

> Just exactly *HOW* do you measure ``literally 100%''?

E.g. over the past four months or so, every single spam that has come
through has been caught.

> How do you account for false positives and false negatives?

Haven't had any of either in four months.

> Do you manually examine every message, whether or not flagged as spam?

Yes.  I go through my quarantine box daily to detect false positives,
and would know if I received a spam.

> As impressive as that phrase ``literally 100%'' is, I am considerably
> skeptical.  I have never -- in thirty years -- found any software
> utility that can beat five-nines statistics.

I'm not suggesting DSPAM is capable of this for every user - and I am
certain that I will receive some spam eventually to ruin my golden
streak, as there are always new types of spams to learn.  My wife
doesn't get 100%; she's been getting around 99% until I tinkered with
dictionary lately (she's one of my guinnea pigs)..and I've talked to
some users who are only getting around 95%...please don't think I'm
trying to suggest my solution is the end-all-be-all solution.  But as
for me, yes I'm getting 100% so far.

> How can we get hold of yours?

http://www.nuclearelephant.com/projects/dspam/

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