Faruque Ahmed : MCP, MCSA, MCSE, MCTS, MCIT, CCNA, OCA, OCP, GCP

spamassassin

apt-get install spamassassin spamc spamd -yapt-get install spamd

# adduser spamd --disabled-login
Full Name []: Press Enter to skipRoom Number []:Press Enter to skipWork Phone []:Press Enter to skipHome Phone []:Press Enter to skipOther []:Press Enter to skipIs the information correct? [Y/n] Y

# vi /etc/spamassassin/local.cf
rewrite_header Subject [**SPAM_SCORE**]required_score 5.0report_safe 0use_bayes 1bayes_auto_learn 1

# systemctl restart spamassassin  # vi /etc/postfix/master.cf

spamassassin unix - n n - - pipe  flags=R user=spamd argv=/usr/bin/spamc -e /usr/sbin/sendmail -oi -f ${sender} ${recipient}

# vi /etc/postfix/main.cf
Add or modify the following line:
content_filter = spamassassin

  systemctl reload postfix
systemctl restart spamassassin systemctl restart postfix

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SpamAssassin with Postfix on Ubuntu

$ sudo apt-get install spamassassin spamc -y

$ sudo adduser spamd --disabled-login

$ sudo nano /etc/default/spamassassin

Find the line:
ENABLED=1
Uncomment it by removing # and change the value from 1 to 0.
ENABLED=0
Find the line:

OPTIONS="--create-prefs --max-children 5 --helper-home-dir"

Change it to include the SpamAssassin user account and log files directory.

OPTIONS="--create-prefs --max-children 5 --username spamd --helper-home-dir /home/spamd/ -s /home/spamd/spamd.log"

3.Find the line:
CRON=0
Change the value from 0 to 1.
CRON=1

SpamAssassin local configuration file

$ sudo mv /etc/spamassassin/local.cf /etc/spamassassin/local.cf.bk

$ sudo nano /etc/spamassassin/local.cf

rewrite_header Subject ***** SPAM _SCORE_ ***** report_safe 0 required_score 5.0 use_bayes 1 use_bayes_rules 1 bayes_auto_learn 1 skip_rbl_checks 0 use_razor2 0 use_dcc 0 use_pyzor 0 ifplugin Mail::SpamAssassin::Plugin::Shortcircuit endif

$ sudo nano /etc/postfix/master.cf

smtp inet n - y - - smtpd #smtp inet n - y - 1 postscreen #smtpd pass - - y - - smtpd #dnsblog unix - - y - 0 dnsblog #tlsproxy unix - - y - 0 tlsproxy submission inet n - y - - smtpd
Below the smtp configuration, add a SpamAssassin content filter.
smtp inet n - y - - smtpd
-o content_filter=spamassassin
spamassassin unix - n n - - pipe user=spamd argv=/usr/bin/spamc -f -e /usr/sbin/sendmail -oi -f ${sender} ${recipient}

sudo systemctl restart postfix.service sudo systemctl enable spamassassin.service sudo systemctl start spamassassin.service

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apt-get install spamassassin spamc

groupadd spamduseradd -g spamd -s /bin/false -d /var/log/spamassassin spamdmkdir /var/log/spamassassinchown spamd:spamd /var/log/spamassassin

edit # vi /etc/default/spamassassin to configure SpamAssassin as follows.

# Change to one to enable spamdENABLED=1
SAHOME="/var/log/spamassassin/"
......OPTIONS="--create-prefs --max-children 5 --helper-home-dir --username spamd \-H ${SAHOME} -s ${SAHOME}spamd.log"

4. As the next step, we change to CRON=1 at the bottom of this file.

# service spamassassin start

# vi /etc/postfix/master.cf. Then add the following line at the end of the file.

spamassassin unix - n n - - pipeuser=spamd argv=/usr/bin/spamc -f -e/usr/sbin/sendmail -oi -f ${sender} ${recipient}

service postfix restart

edit the configuration file # vi /etc/spamassassin/local.cf

# apt-get install dovecot-sieve dovecot-managesieved

# vi /etc/dovecot/conf.d/20-lmtp.conf

protocol lmtp {# Space separated list of plugins to load (default is global mail_plugins).mail_plugins = $mail_plugins sieve}

service dovecot restart
service spamassassin restart

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Install and Configure SpamAssassin with Dovecot and Postfix on Ubuntu Server

Follow these steps to set up an automated spam filter on your Linux Ubuntu web server using SpamAssassin, Dovecot, and Postfix:

Step 1: Install Postfix, Dovecot, and SpamAssassin

Update the package lists and install Postfix, Dovecot, SpamAssassin, and spamc:

sudo apt update

sudo apt install postfix dovecot-imapd dovecot-pop3d spamassassin spamc

Step 2: Enable and start the SpamAssassin service

Enable the SpamAssassin service to start automatically at boot, and then start the service:

sudo systemctl enable spamassassin

sudo systemctl start spamassassin

Step 3: Configure SpamAssassin settings

Edit the SpamAssassin configuration file /etc/spamassassin/local.cf using a text editor (e.g., nano or vim):

sudo nano /etc/spamassassin/local.cf

Add or modify the following settings in the file:

rewrite_header Subject [SPAM]

required_score 5.0

use_bayes 1

bayes_auto_learn 1

These settings will mark emails with a spam score of 5.0 or higher by adding "[SPAM]" to the subject. You can adjust the required_score value as needed. Save the changes and exit the editor.

Step 4: Configure Postfix to use SpamAssassin

Edit the Postfix configuration file /etc/postfix/master.cf:

sudo nano /etc/postfix/master.cf

Add the following lines to the end of the file:

spamassassin unix - n n - - pipe

user=spamd argv=/usr/bin/spamc -f -e

/usr/sbin/sendmail -oi -f ${sender} ${recipient}

Save the changes and exit the editor.

Step 5: Restart Postfix

Restart the Postfix service to apply the changes:

sudo systemctl restart postfix

Step 6: Configure Dovecot

Edit the Dovecot configuration file /etc/dovecot/conf.d/90-sieve.conf:

sudo nano /etc/dovecot/conf.d/90-sieve.conf

Uncomment or add the following lines:

plugin {

sieve = ~/.dovecot.sieve

sieve_default = /etc/dovecot/sieve/default.sieve

sieve_dir = ~/sieve

sieve_global_dir = /etc/dovecot/sieve/global/

}

Save the changes and exit the editor.

Create a default Sieve script /etc/dovecot/sieve/default.sieve:

sudo nano /etc/dovecot/sieve/default.sieve

Add the following content to the file:

require ["fileinto"];

if header :contains "X-Spam-Flag" "YES" {

fileinto "Junk";

}

This script will automatically move messages marked as spam to the "Junk" folder. Save the changes and exit the editor.

Compile the Sieve script:

sudo sievec /etc/dovecot/sieve/default.sieve

Step 7: Restart Dovecot

Restart the Dovecot service to apply the changes:

sudo systemctl restart dovecot

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