[Dovecot] dovecot-dspam-plugin not launching dspam

[Stefan Schmidt]

hello,

i added the dovecot-dspam-plugin [1] to my dovecot-installation. when 
trying to move a mail out of or into the predefined spamfolder with 
thunderbird a messagebox shows : "dspam failed" and the message remains 
in its original position. i am using virtual mail users contained in a 
postgresql-database [2]. normal imap access and dspam training from the 
commandline works fine. a posting concerning probably the same issue has 
been posted on the dspam-mailinglist [3], but there haven't been any 
helpful replies so far. furthermore i suspect the plugin is missing the 
--user option when calling dspam, since this seems to be mandatory 
[4,5], but unfortunately adding this option in the plugin doesn't change 
its behavior. i am working on a debian system and currently using 
dovecot 1.0.beta3-3, dspam 3.6.4-2+b1 and the dspam-plugin "for dovecot 
beta 2 and 3".

1) calling dspam from the commandline with the same parameters as in the 
(slightly modified) plugin works fine

:/# su virtual
:/$ /usr/bin/dspam --user retrain --source=error --stdout --class=spam 
--signature=4,4434846e237406491211187 --debug

-> /var/log/dspam.debug

No QuarantineAgent option found. Using standard quarantine.
DSPAM Instance Startup
input args: /usr/bin/dspam --debug --user retrain --source=error 
--stdout --class=spam --signature=4,4434846e237406491211187
pass-thru args:
processing user retrain
uid = 0, euid = 0, gid = 0, egid = 101
loading preferences for user retrain
Loading preferences for uid 7
Loading preferences for uid 0
Loading preferences for uid 0
default preferences empty. reverting to dspam.conf preferences.
Loading preferences from dspam.conf
using /var/spool/dspam/opt-in/local/retrain.dspam as path
using /var/spool/dspam/opt-out/local/retrain.nodspam as path
sedation level set to: 0
loading preferences for user some_virtual_account at mydomain.com
Loading preferences for uid 4
Loading preferences for uid 0
Loading preferences for uid 0
default preferences empty. reverting to dspam.conf preferences.
Loading preferences from dspam.conf
processing signature.  length: 1344
reversing 112 tokens
Control: [10 10] [11 9] Delta: [1 -1]
reclassifying iteration 1 result: 0
libdspam returned probability of 1.000000
message result: SPAM
DSPAM Instance Shutdown.  Exit Code: 0

2) when dspam is called via the (slightly modified) dovecot-dspam-plugin 
it aborts (the unmodified version aborts the same way)

-> /var/log/mail.err

dovecot: imap-login: Login: user=<someuser at mydomain.com>, method=plain, 
rip=123.123.123.123, lip=123.123.123.123
imap: /usr/bin/dspam --user retrain --source=error --stdout --class=spam 
--signature=4,4434846e237406491211187
dspam[25157]: Unable to determine the destination user
dspam[25157]: DSPAM agent misconfigured: aborting

-> /etc/dspam/dspam.conf [extract]

Home /var/spool/dspam
StorageDriver /usr/lib/dspam/libpgsql_drv.so
TrustedDeliveryAgent "/usr/bin/procmail"
OnFail error
Trust root
Trust dspam
Trust mail
Trust mailnull
Trust smmsp
Trust daemon
Trust virtual
TrainingMode teft
TestConditionalTraining on
Feature chained
Feature whitelist
Algorithm graham burton
PValue graham
Preference "spamAction=deliver"
Preference "signatureLocation=headers"
AllowOverride trainingMode
AllowOverride spamAction spamSubject
AllowOverride statisticalSedation
AllowOverride enableBNR
AllowOverride enableWhitelist
AllowOverride signatureLocation
AllowOverride showFactors
AllowOverride optIn optOut
AllowOverride whitelistThreshold
HashRecMax              98317
HashAutoExtend          on  
HashMaxExtents          0
HashExtentSize          49157
HashMaxSeek             100
HashConnectionCache     10
Notifications   off
PurgeSignatures 14
PurgeNeutral    90
PurgeUnused     90
PurgeHapaxes    30
PurgeHits1S     15
PurgeHits1I     15
LocalMX 127.0.0.1
SystemLog on
UserLog   on
Opt out
ProcessorBias on
Include /etc/dspam/dspam.d/

-> /etc/dspam/dspam.d/pgsql.conf [extract]

PgSQLServer 127.0.0.1
PgSQLPort 5432
PgSQLUser dspam
PgSQLPass mypassword
PgSQLDb libdspam7drvpgsql
PgSQLVirtualTable          dspam_virtual_uids
PgSQLVirtualUIDField       uid
PgSQLVirtualUsernameField  username

-> dspam-headers from samples message

X-DSPAM-Result: Innocent
X-DSPAM-Processed: Thu Apr  6 03:32:07 2006
X-DSPAM-Confidence: 0.7524
X-DSPAM-Probability: 0.0000
X-DSPAM-Signature: 44346f97188755315134984

ciao, stefan

[1] http://johannes.sipsolutions.net/Projects/dovecot-dspam-integration
[2] http://www.gjdv.at/snippets/linux/virtual_mail_hosting
[3] http://www.nuclearelephant.com/projects/dspam/dspam-users/2872.html
[4] http://www.nuclearelephant.com/projects/dspam/dspam-users/2852.html
[5] http://www.nuclearelephant.com/projects/dspam/dspam-users/2850.html