Full Mail Server Solution w/ Virtual Domains & Users (Debian Etch, Postfix, Mysql, Dovecot, DSpam, ClamAV, Postgrey, RBL) - Page 8
F. Training DSPAM
DSPAM can learn what spam is by reading your email, and over time, it will get better at figuring out spam vs. ham by your sending it "firstname.lastname@example.org" and "email@example.com" messages. You can get a head start though, but giving it some initial training. Let's go ahead and set that up.
You're going to need bzip2
# apt-get install bzip2
Then you're going to need to download the training files for DSPAM.
# cd /tmp
# wget http://spamassassin.apache.org/publiccorpus/20050311_spam_2.tar.bz2
# wget http://spamassassin.apache.org/publiccorpus/20030228_easy_ham_2.tar.bz2
Go ahead and decompress them:
# tar xvfj 20050311_spam_2.tar.bz2
# tar xvfj 20030228_easy_ham_2.tar.bz2
...and then finally, train DSPAM:
# dspam_train test spam_2/ easy_ham_2/
DSPAM will now process the files (This will take a while), and fill the database with the resulting tokens. When it is finished, it should be much more accurate.
But hold the phone! What if an email from a VALID source has a virus in it? Well, DSPAM has a nifty tag built into it for ClamAV. So let's get that installed... Debian, again, is awesome:
# apt-get install clamav-daemon
Do a quicky edit of the clamav configuration file to uncomment the TCPSocket line:
... and restart clamav:
# invoke-rc.d clamav-daemon restart
The edit /etc/dspam/dspam.conf
invoke-rc.d dspam restart
And they all lived happily ever after... DSPAM will now check for SPAM, and then check for viruses. SPAM will be put in the aptly-named "SPAM" folder, and the subject will be modified to start with "[SPAM]." Emails with viruses in them will get flat-out rejected by the server.