1. Software Install

yum install postfix spamassassin amavisd-new clamav
chkconfig postfix on
chkconfig clamd on
chkconfig freshclam on
chkconfig amavisd on
chkconfig amavis on

2. Anti-Virus Configuration

<?php
/etc/init.d/clamd start
service amavisd start
service amavis start
# If you are behind a proxy, you need adjust /etc/freshclam.conf
freshclam
freshclam start
?>

amavis unix - - - - 2 smtp
        -o smtp_data_done_timeout=1200
        -o smtp_send_xforward_command=yes
        -o disable_dns_lookups=yes
127.0.0.1:10025 inet n - - - - smtpd
        -o content_filter=
        -o local_recipient_maps=
        -o relay_recipient_maps=
        -o smtpd_restriction_classes=
        -o smtpd_client_restrictions=
        -o smtpd_helo_restrictions=
        -o smtpd_sender_restrictions=
        -o smtpd_recipient_restrictions=permit_mynetworks,reject
        -o mynetworks=127.0.0.0/8
        -o strict_rfc821_envelopes=yes
        -o receive_override_options=no_unknown_recipient_checks,no_header_body_checks
        -o smtpd_bind_address=127.0.0.1

3. Test Setup

4. Spam Denial

RBLDNSD

1. Install the rbldns RPM (available in Fedora Extras, or source)
2. Edit your named.conf and add:

   
   zone "clients.blocked.rbl" IN {
           type forward;
           forward first;
           forwarders { 127.0.0.1 port 530; };
   };
   zone "hosts.blocked.rbl" IN {
           type forward;
           forward first;
           forwarders { 127.0.0.1 port 530; };
   };
   
   

3. Edit /etc/sysconfig/rbldnsd and add the following lines:

   
   RBLDNSD="dsbl -r/var/lib/rbldnsd -b 127.0.0.1/530 \
   clients.blocked.rbl:ip4set:clients,dynamic \
   hosts.blocked.rbl:dnset:hosts \
   "
   
   

4. Get the latest RBLDNS databases and move database files to /var/lib/rbldnsd
5. Gentlepeople, start your daemons: "service restart named; service restart rbldnsd;" Test with telnet localhost 53; and telnet locahost 530;
6. Preform a test lookup:

   
   $dig @localhost 223.61.83.162.clients.blocked.rbl -t txt
   ;; ANSWER SECTION:
   223.61.83.162.clients.blocked.rbl. 2048 IN TXT "DNSBL. 162.83.61.223 is a known spam source. Mail from 162.83.61.223 is NOT accepted on this server!"
   
   

7. Update the following line of your /etc/postfix/main.cf

   
   smtpd_recipient_restrictions = permit_mynetworks,reject_unauth_destination,reject_rbl_client clients.blocked.rbl,reject_rhsbl_client hosts.blocked.rbl,reject_rhsbl_sender hosts.blocked.rbl
   
   

5. Other tutorails