I've been using SA for a few weeks and like it pretty well.  It gives me
some occasional false +ives, but not a huge number.

I got a false -ive today that has me scratching my head though.  Here are
the headers:

    Return-Path: <[EMAIL PROTECTED]>
    Received: from cali-2.pobox.com (cali-2.pobox.com [64.71.166.115])
            by manatee.mojam.com (8.12.1/8.12.1) with ESMTP id g4E7jSlq013015
            for <[EMAIL PROTECTED]>; Tue, 14 May 2002 02:45:28 -0500
    Received: from cali-2.pobox.com (localhost.localdomain [127.0.0.1])
            by cali-2.pobox.com (Postfix) with ESMTP id 0BBCB3EA83
            for <[EMAIL PROTECTED]>; Tue, 14 May 2002 03:45:28 -0400 (EDT)
    Delivered-To: [EMAIL PROTECTED]
    Received: from mail.python.org (mail.python.org [63.102.49.29])
            by cali-2.pobox.com (Postfix) with ESMTP id 9996F3EA79
            for <[EMAIL PROTECTED]>; Tue, 14 May 2002 03:45:27 -0400 (EDT)
    Received: from localhost.localdomain ([127.0.0.1] helo=mail.python.org)
            by mail.python.org with esmtp (Exim 4.02)
            id 177Wzu-00060w-00; Tue, 14 May 2002 03:45:26 -0400
    Received: from exim by mail.python.org with spamc (Exim 4.02)
            id 177WzL-0005s6-00
            for [EMAIL PROTECTED]; Tue, 14 May 2002 03:44:51 -0400
    Received: from [210.22.158.90] (helo=yahoo.com)
            by mail.python.org with smtp (Exim 4.02)
            id 177WzH-0005p5-00
            for [EMAIL PROTECTED]; Tue, 14 May 2002 03:44:48 -0400
    Received: from [16.62.36.206] by rly-xr02.mx.aol.com with local; Sun, 12 May 2002 
13:37:47 +1200
    Received: from mail.gmx.net ([63.56.48.59])
            by a231242.upc-a.chello.nl with esmtp; Sat, 11 May 2002 02:35:23 +0900
    Received: from 111.50.61.166 ([111.50.61.166]) by ssymail.ssy.co.kr with asmtp; 
Thu, 9 May 2002 15:32:59 +1000
    Received: from 158.45.73.20 ([158.45.73.20]) by f64.law4.hotmail.com with QMQP; 
Wed, 8 May 2002 04:30:35 -0000
    Received: from unknown (206.39.85.127)
            by q4.quik.com with esmtp; Mon, 6 May 2002 17:28:11 -0700
    Message-ID: <563845EE-3858-4F79-B033-9380BE290BB4@Z8OIEIRJ>
    MIME-Version: 1.0
    Content-Type: multipart/mixed;
            boundary="----=_NextPart_000_00X9_71A11C1E.E1232J43"
    X-Priority: 3 (Normal)
    X-MSMail-Priority: Normal
    X-Mailer: AOL 7.0 for Windows US sub 118
    Importance: Normal
    Errors-To: [EMAIL PROTECTED]
    X-BeenThere: [EMAIL PROTECTED]
    X-Mailman-Version: 2.0.10 (101270)
    Precedence: bulk
    List-Help: <mailto:[EMAIL PROTECTED]?subject=help>
    List-Post: <mailto:[EMAIL PROTECTED]>
    List-Subscribe: <http://mail.python.org/mailman/listinfo/python-help>,
            <mailto:[EMAIL PROTECTED]?subject=subscribe>
    List-Id: Expert volunteers answer Python-related questions <python-help.python.org>
    List-Unsubscribe: <http://mail.python.org/mailman/listinfo/python-help>,
            <mailto:[EMAIL PROTECTED]?subject=unsubscribe>
    List-Archive: <http://mail.python.org/mailman/private/python-help/>
    X-Spam-Status: No, hits=-96.2 required=4.8 
tests=NO_REAL_NAME,BASE64_ENC_TEXT,USER_IN_WHITELIST version=2.11
    From: <[EMAIL PROTECTED]>
    Sender: [EMAIL PROTECTED]
    To: <[EMAIL PROTECTED]>
    Subject: [Python-Help] ebay users list products.. 7g8Kwze5GxgcJ1
    Date: Tue, 14 May 2002 03:44:48 -0400
    Reply-To: <[EMAIL PROTECTED]>

Using the -t flag I'm told the USER_IN_WHITELIST test contributed a -100 to
the hits.  Unfortunately, I don't have any ebay.com addresses (or glob
patterns involving ebay.com) in my user_prefs file.  I am running SA in the
usual way from .procmailrc:

    :0fw
    | spamassassin -P

    :0:
    * ^X-Spam-Status: Yes
    $SPAM

My list of whitelist_from patterns is short:

    whitelist_from [EMAIL PROTECTED]
    whitelist_from [EMAIL PROTECTED]
    whitelist_from [EMAIL PROTECTED]
    whitelist_from [EMAIL PROTECTED]
    whitelist_from *@autox.team.net

What gives?

Corollary question: The message was BASE64 encoded, adding 3.2 to the score,
but seems to have deterred SA from digging into the actual content.  I
decoded it and saw it was HTML from a web site promotion/marketing company.
A casual scan of the text suggested to me that had SA looked, it would have
significantly raised the score ("We Create Massive Traffic For Your Web
Site", etc).

Seems like a "single point of failure", if all a bad guy has to do is mime
encode their junk.

-- 
Skip Montanaro ([EMAIL PROTECTED] - http://www.mojam.com/)
"Excellant Written and Communications Skills required" - seen on chi.jobs

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