[AC web] another category of instant-death spam
APPROVE COMMIT web
Some spammers are "obscuring" headers by "encoding" them as
"quoted-printable UTF-8" even though they contain only ASCII.
This looks like the kind of thing that a brain-dead MUA might do if a
user asked it to do so, so I have hesitated, but there have been no
false positives in many months, and recently I've been seeing hundreds
in a week.
Index: Lists/ChangeLog
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RCS file: /pack/xemacscvs/XEmacs/xemacsweb/Lists/ChangeLog,v
retrieving revision 1.26
diff -u -U0 -r1.26 ChangeLog
--- Lists/ChangeLog 30 Dec 2004 08:44:04 -0000 1.26
+++ Lists/ChangeLog 15 Feb 2005 09:12:00 -0000
＠＠ -0,0 +1,4 ＠＠
+2005-02-15 Stephen J. Turnbull <stephen(a)xemacs.org>
+
+ * index.content: Add utf8-obfoo to the instant-death list in #spam.
+
Index: Lists/index.content
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RCS file: /pack/xemacscvs/XEmacs/xemacsweb/Lists/index.content,v
retrieving revision 1.26
diff -u -r1.26 index.content
--- Lists/index.content 30 Dec 2004 08:44:05 -0000 1.26
+++ Lists/index.content 15 Feb 2005 09:09:19 -0000
＠＠ -485,8 +485,7 ＠＠
Due to a dramatic increase in the amount of spam and a near
perfect record of like 0.05% false positives, we are discarding
near-certain spam without checking as of 2004-04-27. We have
- added two more categories as of 2004-05-25. We've added several
- more categories as of 2004-12-30. Here are the
+ added more categories as recently as 2005-02-15. Here are the
criteria, any of which qualifies your post for automatic discard:
</p>
＠＠ -517,6 +516,10 ＠＠
Have a From or Sender address that procmail thinks is a daemon.
Basically that means sendmail and other MTAs, mailing list
managers, and root.
+ </li>
+ <li>
+ Have From, To, <em>and</em> Subject headers containing 100%
+ ASCII text encoded as utf-8 quoted-printable.
</li>
</ol>
--
Graduate School of Systems and Information Engineering University of Tsukuba
http://turnbull.sk.tsukuba.ac.jp/ Tennodai 1-1-1 Tsukuba 305-8573 JAPAN
Economics of Information Communication and Computation Systems
Experimental Economics, Microeconomic Theory, Game Theory