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Received: from [18.104.22.168] by web80505.mail.mud.yahoo.com via HTTP; Mon, 11 Oct 2010 11:06:16 PDT
The line above is probably giving you spammer's source IP (or http proxy --- some SP use trans. fwd. proxies).
Analyse that IP address and other similar spammers. If the region is not important blacklist the block in 22.214.171.124.
Or create a heuristic(s) that states: if mail is from Yahoo, contains a single line and from that IP block, then junk it. You'll need to test and make sure it doesn't have much FP.
From: Igor Chudov
To: Spamassassin Mailing List
Subject: One-liner spams
Sent: Oct 11, 2010 10:12 PM
I receive plenty of one-liner spams from hacked webmail accounts,
advertising various fronts of a Chinese retailer of a certain famous
chemical compound that enables sinful behaviors for people who were
not capable physically.
Example of such an email is here:
I fully realize that these emails are difficult to trap, but, perhaps,
I am missing some innovations in the spamfighting field? Any idea how
I can kill them?