[Spambayes] tons of false positives after upgrading

Nate Tanner Fri, 07 Jan 2005 13:56:26 -0800

i had been using version 0.3 of spambayes for a long time (XP/outlook express) and it was working fairly well. i recently upgraded to 1.0.1, and now i get a ton of false positives (including the confirmation and welcome messages from this mailing list !!) probably close to 20% of my valid emails are being marked as spam.

does anyone have any ideas about how to fix this problem? it's worse now than if i had no filter, because i have to comb through every spam looking for non-spams! please help!

more details:

Summary:

POP3 proxy running on 110, proxying to xxx.com:110.
Active POP3 conversations: 0.
POP3 conversations this session: 53.
Emails classified this session: 163 spam, 19 ham, 50 unsure.
Total emails trained: Spam: 1299 Ham: 3644

Configuration:

(not using SMTP proxy)

Storage:

cache messages: Yes

Suppress caching: No

Maximum size of cached messages: 0

Ham cutoff: 0.2

Spam cutoff: 0.9

Clues:

here is the info from the Message Clues page (the "Clues" link) from one of the false positives. it is marked as 99.7% spam probability! and it appears that it is counting the "spam," string in the 'subject' and 'to' fields as part of the reason to consider it spam (?), even though those were added by Spambayes.

Spam probability: 99.70% (0.997016765123).

Clues for: spam,Welcome to the "Spambayes" mailing list (93)

Word	Probability	Times in ham	Times in spam
H	1.7e-005	-	-
S	0.99405	-	-
sender:no real name:2**0	0.004644	48	0
remind	0.034884	6	0
password,	0.050562	4	0
xxxxxxxx	0.091837	2	0
adjustments	0.155172	1	0
etc.),	0.155172	1	0
list!	0.155172	1	0
subject:mailing	0.155172	1	0
url:listinfo	0.155172	1	0
url:mailman	0.155172	1	0
subject: "	0.157739	61	4
subject:list	0.177272	53	4
reminder	0.199865	12	1
is:	0.248435	26	3
url:mail	0.248925	9	1
options	0.307251	13	2
post	0.320238	42	7
from	0.607329	466	257
know	0.612518	172	97
there	0.617636	144	83
month,	0.617901	12	7
message	0.622114	235	138
skip:i 10	0.625768	176	105
url:org	0.634305	71	44
how	0.637903	132	83
unsubscribe	0.65723	32	22
once	0.657664	48	33
to:addr:lunchclub.net	0.658645	955	657
page	0.661866	60	42
header:Errors-To:1	0.667086	4	3
header:Return-Path:1	0.667277	1137	813
header:Subject:1	0.673037	1135	833
header:From:1	0.675923	1139	847
header:To:1	0.67644	1139	849
header:Date:1	0.676889	1138	850
about	0.679786	161	122
with	0.693328	408	329
get	0.703141	239	202
subject:	0.707308	781	673
email	0.709556	203	177
change	0.710765	34	30
to:2**1	0.710965	18	16
that	0.723317	312	291
(including	0.724572	4	4
make	0.726513	99	94
button	0.72863	6	6
and	0.728874	534	512
instructions	0.732838	12	12
charset:us-ascii	0.738767	212	214
back	0.739152	71	72
the	0.742406	537	552
include	0.742591	25	26
current	0.745397	39	41
want	0.748789	107	114
subject	0.750232	38	41
although	0.754605	7	8
will	0.756049	245	271
header:Message-ID:1	0.763062	484	556
changing	0.764858	4	5
also	0.766808	85	100
visit	0.769583	61	73
account	0.77246	41	50
can	0.775256	216	266
must	0.776564	36	45
you.	0.780946	76	97
header:MIME-Version:1	0.781444	512	653
this	0.784279	333	432
via	0.785055	35	46
your	0.786259	368	483
mailing	0.786413	21	28
you	0.786524	423	556
at:	0.795161	17	24
subject:the	0.80783	25	38
information	0.812949	90	140
switch	0.824395	2	4
subscription	0.832119	3	6
from:no real name:2**0	0.835566	78	142
every	0.837444	35	65
disable	0.844828	0	1
unsubscribe.	0.853973	1	3
such	0.854951	21	45
to:no real name:2**1	0.861546	14	32
proto:http	0.861931	333	742
url:net	0.870269	51	123
ever	0.874069	23	58
passwords	0.908163	0	2
subject:,	0.951673	1	11
body	0.954103	2	19
subject:spam	0.965874	1	16
digest	0.97619	0	9
to:addr:spam	0.97619	0	9

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[Spambayes] tons of false positives after upgrading

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