Falko, I tried to do a re-install of the postfix and hit the same issue. As before, build-essential is installed... Again, I've hit this error message below
mx1:/etc/postfix# adduser clamav amavis
Adding user `clamav' to group `amavis' ...
mx1:/etc/postfix# /etc/init.d/amavis restart
Stopping amavisd: (not running).
Starting amavisd: No listen sockets or ports specified
I am not sure why I getting the above error - Any thoughtts/suggestions?