Re: speaking of articles

[http://www.outformations.com/~dek]

Brian's technique with dspam/qmail from http://www.ghidinelli.com/blog/

Fighting spam with DSPAM and Qmail
Monday, July 21, 2003
DSPAM is a Bayesian-based server-side spam filtering software. It learns 
based upon user input to be deadly accurate with almost zero false 
matches. It is free and integrates with a number of mail servers.

On our servers, we use Qmail with vpopmail for virtual domain mail 
handling. This setup is widely used and very robust.

Unfortunately, there are no public webpages describing how to make Dspam 
work with Qmail that can be found via Google. This post provides Qmail 
users with the bits they need to get up to speed.

The secret sauce is in installing safecat as the mail delivery agent and 
using the following build syntax for DSPAM:

./configure --with-local-delivery-agent='/usr/local/bin/safecat 
Maildir/tmp Maildir/new' --with-userdir=/var/dspam 
--with-db4-includes=/usr/local/BerkeleyDB.4.1/include 
--with-dspam-owner=vpopmail --with-dspam-group=vchkpw 
--with-userdir-owner=vpopmail --with-userdir-group=vchkpw

Once installed, each user directory can have a .qmail file with the 
following syntax to use DSPAM:

|/usr/local/bin/dspam --user $EXT

This approach allows you to place the .qmail file into each user 
directory. Each user should also have a <username>-spam alias they 
can forward spam to so that DSPAM learns what each user considers spam:

|/usr/local/bin/dspam --user $EXT --addspam

Remember, Bayesian filters define spam on a per-user basis. If one user 
thinks that email from Amazon is spam and flags it as such, that user will 
stop receiving Amazon mail and the rest of the users on the system will be 
unaffected. If you aren't using vpopmail and want just normal delivery, 
you can use the following build syntax (provided by Doug Miller and Tom 
Hartley):

./configure --with-local-delivery-agent='/usr/local/bin/safecat 
$HOME/Maildir/tmp $HOME/Maildir/new' --with-userdir=/var/dspam 
--with-db4-includes=/usr/local/BerkeleyDB.4.1./include

These tips should bridge the gap between the DSPAM documentation and Qmail 
documentation.

Update 7/24/03: It seems as though including preline in the .qmail file 
may break certain clients such a Lotus Notes. Removing the preline command 
should work just fine:

|/usr/local/bin/dspam --user $EXT