Test message without From

Looks like you fell at the first hurdle. Interesting combination of header
prepend, append, and insertion by various MTAs. Did Yahoo! prepended the
From:? (How did it know your email address?) -- it appears before
Yahoo!s Received.

above.proper inserted its Message-ID: below the From: and prepended its
Date:, Received:s and X-Authentication-Warning:, and appended its List-*.
My machines appended X-Cam-* and prepended Received: and X-Sieve.

Tony.
-- 
f.a.n.finch  <[email protected]>  http://dotat.at/
SELSEY BILL TO LYME REGIS: SOUTHWEST 4 OR 5, INCREASING 6 NEAR EXPOSED
HEADLANDS FOR A TIME IN AFTERNOON AND EVENING. RAIN AND DRIZZLE AT TIMES.
MODERATE OR GOOD, OCCASIONALLY POOR. MODERATE OR ROUGH.

---------- Forwarded message ----------
Return-Path: <[email protected]>
Received: from ppsw-5-intramail.csi.cam.ac.uk ([192.168.128.135])
    by cyrus-1.csi.private.cam.ac.uk (Cyrus v2.1.16-HERMES)
    with LMTP; Wed, 16 Mar 2005 12:02:37 +0000
X-Sieve: CMU Sieve 2.2
Received: from above.proper.com ([208.184.76.39]:4340)
    by ppsw-5.csi.cam.ac.uk (mx.cam.ac.uk [131.111.8.145]:25)
    with esmtp id 1DBXEI-00043G-J0 (Exim 4.44) for [email protected]
    (return-path <[email protected]>); Wed, 16 Mar 2005 12:02:27 +0000
Received: from above.proper.com (localhost.vpnc.org [127.0.0.1])
    by above.proper.com (8.12.11/8.12.9) with ESMTP id j2GBvS2W038038;
    Wed, 16 Mar 2005 03:57:28 -0800 (PST)
    (envelope-from [email protected])
Received: (from majordom@localhost)
    by above.proper.com (8.12.11/8.12.9/Submit) id j2GBvSl8038037;
    Wed, 16 Mar 2005 03:57:28 -0800 (PST)
X-Authentication-Warning: above.proper.com: majordom set sender to
    [email protected] using -f
Received: from smtp810.mail.ukl.yahoo.com (smtp810.mail.ukl.yahoo.com
    [217.12.12.200])
    by above.proper.com (8.12.11/8.12.9) with SMTP id j2GBvRTb037987
    for <[email protected]>; Wed, 16 Mar 2005 03:57:28 -0800 (PST)
    (envelope-from [email protected])
Date: Wed, 16 Mar 2005 03:57:27 -0800 (PST)
From: [email protected]
Message-Id: <[email protected]>
Received: from unknown (HELO clerew.man.ac.uk) ([email protected]@81.144.68.191
    with poptime)
  by smtp810.mail.ukl.yahoo.com with SMTP; 16 Mar 2005 11:55:32 -0000
To: ietf-822 <[email protected]>
Subject: Test message without From
Reply-To: ietf-822 <[email protected]>
Sender: [email protected]
Precedence: bulk
List-Archive: <http://www.imc.org/ietf-822/mail-archive/>
List-ID: <ietf-822.imc.org>
List-Unsubscribe: <mailto:[email protected]?body=unsubscribe>
X-Cam-ScannerInfo: http://www.cam.ac.uk/cs/email/scanner/
X-Cam-AntiVirus: No virus found
X-Cam-SpamDetails: scanned, SpamAssassin (score=0.228, FORGED_RCVD_HELO 0.05,
    MSGID_FROM_MTA_HEADER 0.00, NO_REAL_NAME 0.18)


Please will any recipient who receives this message with a From header
field in it report what he saw to this list.

-- 
Charles H. Lindsey ---------At Home, doing my own thing------------------------
Tel: +44 161 436 6131 Fax: +44 161 436 6133   Web: http://www.cs.man.ac.uk/~chl
Email: [email protected]      Snail: 5 Clerewood Ave, CHEADLE, SK8 3JU, U.K.
PGP: 2C15F1A9      Fingerprint: 73 6D C2 51 93 A0 01 E7 65 E8 64 7E 14 A4 AB A5