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Posted to dev@spamassassin.apache.org by bu...@bugzilla.spamassassin.org on 2007/06/01 04:32:02 UTC
[Bug 5491] New: MIME_QP_LONG_LINE triggering on valid email
http://issues.apache.org/SpamAssassin/show_bug.cgi?id=5491
Summary: MIME_QP_LONG_LINE triggering on valid email
Product: Spamassassin
Version: 3.2.0
Platform: Other
OS/Version: other
Status: NEW
Severity: normal
Priority: P5
Component: Rules
AssignedTo: dev@spamassassin.apache.org
ReportedBy: jhaar@trimble.co.nz
I know the RFCs say any email that contains QP is meant to have 76char line
limits, but it appears to me a lot of email apps developers don't read the RFCs.
I have noticed this rule triggering a lot here: 6% of email classified as HAM by
SA triggered the MIME_QP_LONG_LINE rule.
Attached is a mail message that got a score of 5.7/5 - 1.8 points of which was
from MIME_QP_LONG_LINE.
Even though the RFC states 76 chars, would upping it to (say) 80 chars stop it
hitting spam? i.e. are the spammers who this rule affects the sorts of morons
who write one loooooong QP sentence, or are they writing it as 78char too?
Thanks
Jason
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[Bug 5491] MIME_QP_LONG_LINE triggering on valid email
Posted by bu...@bugzilla.spamassassin.org.
http://issues.apache.org/SpamAssassin/show_bug.cgi?id=5491
------- Additional Comments From blentz@channing-bete.com 2007-06-22 07:48 -------
I concur, I've had several FPs at my site, with this rule being the straw that
breaks the camel's back. This is mostly happening on newsletter-type emails
(Boston Globe, for example), scoring a combination of MIME_HTML_ONLY +
MIME_QP_LONG_LINE + DCC/Razor2/Pyzor (because it's bulk, but it's not spam).
I'm thinking maybe the point value should be adjusted down, rather than changing
the length, if the existing length is based on a particular RFC defining QP.
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[Bug 5491] MIME_QP_LONG_LINE triggering on valid email
Posted by bu...@bugzilla.spamassassin.org.
http://issues.apache.org/SpamAssassin/show_bug.cgi?id=5491
------- Additional Comments From felicity@apache.org 2007-06-25 11:40 -------
FWIW, I wrote up a quoted-printable length function similar to the base64 length
function. Here are some results:
0.352 0.4118 0.0100 0.976 1.00 0.00 T_QP_LENGTH_84_85
0.253 0.2971 0.0000 1.000 0.92 0.00 T_QP_LENGTH_82_83
0.314 0.3666 0.0100 0.973 0.88 0.00 T_QP_LENGTH_83_84
2.567 2.9953 0.0903 0.971 0.79 0.00 T_QP_LENGTH_81_82
4.209 4.8874 0.2911 0.944 0.71 0.00 T_QP_LENGTH_79_80
14.397 16.4744 2.3989 0.873 0.53 0.00 MIME_QP_LONG_LINE
4.975 5.7196 0.6725 0.895 0.50 0.00 T_QP_LENGTH_90_INF
5.701 6.4911 1.1342 0.851 0.46 0.00 T_QP_LENGTH_78_79
0.142 0.1668 0.0000 1.000 0.45 0.00 T_QP_LENGTH_89_90
2.755 3.1656 0.3814 0.892 0.42 0.00 T_QP_LENGTH_80_81
10.542 9.4239 17.0029 0.357 0.25 0.00 T_QP_LENGTH_77_78
0.230 0.2571 0.0703 0.785 0.24 0.00 T_QP_LENGTH_87_88
0.267 0.2902 0.1305 0.690 0.15 0.00 T_QP_LENGTH_86_87
0.243 0.2624 0.1305 0.668 0.03 0.00 T_QP_LENGTH_85_86
0.095 0.0990 0.0703 0.585 0.00 0.00 T_QP_LENGTH_88_89
So there's no clear winner here, though 81-85 may be interesting.
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[Bug 5491] MIME_QP_LONG_LINE triggering on valid email
Posted by bu...@bugzilla.spamassassin.org.
http://issues.apache.org/SpamAssassin/show_bug.cgi?id=5491
blentz@channing-bete.com changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |blentz@channing-bete.com
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[Bug 5491] MIME_QP_LONG_LINE triggering on valid email
Posted by bu...@bugzilla.spamassassin.org.
http://issues.apache.org/SpamAssassin/show_bug.cgi?id=5491
felicity@apache.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Attachment #3955|message/rfc822 |text/plain
mime type| |
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[Bug 5491] MIME_QP_LONG_LINE triggering on valid email
Posted by bu...@bugzilla.spamassassin.org.
http://issues.apache.org/SpamAssassin/show_bug.cgi?id=5491
------- Additional Comments From jhaar@trimble.co.nz 2007-05-31 19:32 -------
Created an attachment (id=3955)
--> (http://issues.apache.org/SpamAssassin/attachment.cgi?id=3955&action=view)
email demonstrating bad QP
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