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

RockyLinux 8.4

gg https://korodes.com/en/rocky_08-2/RockyLinux 8.4 ; Installing a mail server# dnf -y install postfix dovecot cyrus-sasl cyrus-sasl-plain cyrus-sasl-devel# systemctl enable postfix# systemctl enable dovecot# systemctl enable saslauthd

# rpm -qa | grep postfixpostfix-2.10.1-7.el7.x86_64

# rpm -qa | grep saslcyrus-sasl-plain-2.1.26-23.el7.x86_64cyrus-sasl-lib-2.1.26-23.el7.x86_64cyrus-sasl-devel-2.1.26-23.el7.x86_64cyrus-sasl-md5-2.1.26-23.el7.x86_64 　　If this is not present　# dnf install cyrus-sasl-md5cyrus-sasl-2.1.26-23.el7.x86_64

Register Postfix to the service.
# systemctl enable postfix.serviceCreated symlink from /etc/systemd/system/multi-user.target.wants/postfix.service to/usr/lib/systemd/system/postfix.service.

Editing the Postfix Configuration File

①Editing the SMTP Authentication Configuration File
Back up the SMTP authentication configuration file

# cp -p /etc/sasl2/smtpd.conf `date '+ /etc/sasl2/smtpd.conf.%Y%m%d'`
# vi /etc/sasl2/smtpd.conf
■ Insert "#" at the beginning of the first and second lines, and add the contents# pwcheck_method: saslauthd# mech_list: plain loginpwcheck_method: auxpropauxprop_plugin: sasldbmech_list: cram-md5 digest-md5 plain login
➁Registering the saslauthd service

# systemctl enable saslauthd.serviceCreated symlink from /etc/systemd/system/multi -user.target.wants/saslauthd.service to/usr/lib/systemd/sy stem/saslauthd.service.
# systemctl is-enabled saslauthd.serviceenabled

# systemctl start saslauthd.service

3.Anti-spam settings

# dnf -y install --enablerepo=epel spamassassin spamass-milter-postfix# systemctl start spamassassin# systemctl enable spamassassin

Configuring SpamAssassin

# vi /etc/mail/spamassassin/v310.pre
■Enable the TextCat plugin by removing the # at the beginning of the line per line 24loadplugin Mail::SpamAssassin::Plugin::DCC

Install a script to update the SpamAssassin configuration file.

# vi /opt/spamassassin-update.sh
#!/bin/bash　
cd /etc/mail/spamassassinwget -q https://github.com/kittyfreak/spamassassin_user_prefs/archive/refs/heads/main.zip　[ $? -ne 0 ] && exit　unzip main.zip >/dev/null 2>&1　[ $? -ne 0 ] && exit　rm -f main.zip　
mv spamassassin_user_prefs-main/user_prefs .　rm -rf spamassassin_user_prefs-maindiff user_prefs user_prefs.org > /dev/null 2>&1　if [ $? -ne 0 ]; then　cp user_prefs local.cf　
# Do not use attachment format for emails that are judged as spam.echo "report_safe 0" >> local.cf　
# Add "***SPAM***" to the subject line of emails judged to be spam.echo "rewrite_header Subject ***SPAM***" >> local.cf　
# Restart SpamAssassinsystemctl restart spamassassin.service > /dev/null　fi　cp user_prefs user_prefs.org

Grant execute permission to the spamassassin-update script and run it.

# chmod 700 /opt/spamassassin-update.sh# /opt/spamassassin-update.sh

Make sure that the SpamAssassin configuration file is created in the /etc/mail/spamassassin directory on the current date.

directory as of the current date.

# ls -l /etc/mail/spamassassindrwxr-xr-x 2 root root 59 6 月 7 20:02 channel.d-rw-r--r-- 1 root root 1289 10 月16 2018 init.pre-rw-r--r-- 1 root root 486543 9 月 11 20:24 local.cf ←Check that the date is the same as the execution date.drwx------ 2 root root 6 10 月16 2018 sa-update-keys-rw-r--r-- 1 root root 62 10 月16 2018 spamassassin-default.rc

⑤Configuring Postfix to incorporate SpamAssassin

# vi /etc/postfix/master.cf
■Add a "#" to the beginning of the line around line 11 and add SpamAssassin settings on line 12# smtp inet n - n - - smtpdsmtp inet n - n - - smtpd -o content_filter=spamassassin■Add to last linespamassassin unix - n n - - pipeuser=nobody argv=/usr/bin/spamc -e /usr/sbin/sendmail.postfix -oi -f ${sender} ${recipient}

gg

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