Disabling Clamd and Amavisd

If you want to run postfix but not run the antivirus (Clam, Amavis), there is a way to disable those services while allowing postfix to run as normal. Follow the instructions below.

Edit the file /etc/postfix/main.cf

And comment the following 2 lines as follows (you can find the lines by searching on vim with the / command):

#content_filter = amavis:[127.0.0.1]:10024
#receive_override_options = no_address_mappings

Now edit the file /etc/postfix/master.cf

And comment out the following blocks as follows:

#amavis unix - - - - 2 smtp
#        -o smtp_data_done_timeout=1200
#        -o smtp_send_xforward_command=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 receive_override_options=no_unknown_recipient_checks,no_header_body_checks
#        -o smtp_send_xforward_command=yes
#        -o disable_dns_lookups=yes
 
 
#127.0.0.1:10027 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 receive_override_options=no_unknown_recipient_checks,no_header_body_checks
#        -o smtp_send_xforward_command=yes
#	    -o milter_default_action=accept
#    	-o milter_macro_daemon_name=ORIGINATING
#        -o disable_dns_lookups=yes

Next, stop the services:

systemctl stop amavisd
systemctl stop clamd@amavisd

And disable the services from startup:
systemctl disable amavisd
systemctl disable clamd@amavisd

You can reboot your server, or restart postfix by entering:
systemctl restart postfix