CentOS 7
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Postfix + Clamav + Amavisd
2014/09/26
 
Configure Virus-Scanning with Postfix + Clamav.
[1]
[2] Install Amavisd and Clamav Server, and start Clamav Server first.
# install from EPEL

[root@mail ~]#
yum --enablerepo=epel -y install amavisd-new clamav-server clamav-server-systemd
[root@mail ~]#
cp /usr/share/doc/clamav-server*/clamd.sysconfig /etc/sysconfig/clamd.amavisd

[root@mail ~]#
vi /etc/sysconfig/clamd.amavisd
# line 1, 2: uncomment and change

CLAMD_CONFIGFILE=/etc/clamd.d/
amavisd.conf

CLAMD_SOCKET=/var/run/
clamd.amavisd
/clamd.sock
[root@mail ~]#
vi /etc/tmpfiles.d/clamd.amavisd.conf
# create new

d /var/run/clamd.amavisd 0755 amavis amavis -
[root@mail ~]#
vi /usr/lib/systemd/system/clamd@.service
# add to the end

[Install]
WantedBy=multi-user.target
[root@mail ~]#
systemctl start clamd@amavisd

[root@mail ~]#
systemctl enable clamd@amavisd

[3] Configure Amavisd.
[root@mail ~]#
vi /etc/amavisd/amavisd.conf
# line 20: change to the own domain name

$mydomain = '
srv.world
';
# line 152: change to the own hostname

$myhostname = '
mail.srv.world
';
# line 154: uncomment

$notify_method = 'smtp:[127.0.0.1]:10025';
$forward_method = 'smtp:[127.0.0.1]:10025';
[root@mail ~]#
systemctl start amavisd spamassassin

[root@mail ~]#
systemctl enable amavisd spamassassin

[4] Configure Postfix.
[root@mail ~]#
vi /etc/postfix/main.cf
# add to the end

content_filter=smtp-amavis:[127.0.0.1]:10024
[root@mail ~]#
vi /etc/postfix/master.cf
# add to the end

smtp-amavis unix -    -    n    -    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    -    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 smtpd_error_sleep_time=0
    -o smtpd_soft_error_limit=1001
    -o smtpd_hard_error_limit=1000

[root@mail ~]#
systemctl restart postfix

[5] It' OK all.
These lines below are added in the header section of emails after this configuration and emails with known Virus will not sent to Clients.
 
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