Ubuntu 22.04
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Mail Server : Postfix + Clamav + Amavisd2022/05/17
 
Configure Virus-Scanning with Postfix + Clamav.
[1]
Install Clamav, refer to here.
[2] Install Amavisd and Clamav Server, and start Clamav Server first.
root@mail:~#
apt -y install clamav-daemon amavisd-new
root@mail:~#
vi /etc/amavis/conf.d/15-content_filter_mode
# uncomment to enable virus scanning

@bypass_virus_checks_maps = (
   \%bypass_virus_checks, \@bypass_virus_checks_acl, \$bypass_virus_checks_re);
# add own domain name

root@mail:~#
echo 'srv.world' > /etc/mailname
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:~#
usermod -aG amavis clamav

root@mail:~#
systemctl restart clamav-daemon amavis postfix

[3] That's OK all.
[X-Virus-Scanned: ***] lines 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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