# Install debian packages 'libzmq-ffi-perl' and 'libzmq3-dev' 
#
apt-get install libzmq-ffi-perl libzmq3-dev


# Install CPAN module 'ZMQ::LibZMQ3'
#
perl -MCPAN -e 'install ZMQ::LibZMQ3'


# Adjust file '/etc/amavis/conf.d/50-user'
#
# Add 
#
#    '$enable_zmq = 1;'
#
# BEFOR lines
#
#    #------------ Do not modify anything below this line -------------
#    1;  # ensure a defined return
#
vim /etc/amavis/conf.d/50-user


# Restart amavis
#
systemctl restart amavis


# Ajust file '/etc/default/amavis-mc'
#
# Set/Repalce:
#
#    ENABLED="yes"
#
perl -i -n -p -e"s/(\s*ENABLED=.*)/#\1\nENABLED=\"yes\"/" /etc/default/amavis-mc


# (Re)start 'amavis-mc'
#
systemctl restart amavis-mc