how to enable logging for amavis
 

I tried this inside: /etc/amavis/conf.d/50-user

# Enable Logging
#

$DO_SYSLOG = 1;
$LOGFILE = "/var/log/amavis.log"; # (defaults to empty, no log)

# Set the log_level to 5 for debugging
$log_level = 5; # (defaults to 0)

and restarted amavis. and yet, the log file hasn't even been created... Am I on the right track?

amavis logs to the mail log file. There is no additional logfile used.

ok, so the above entries inside /etc/amavis/conf.d/50-user are redundant?
Ok, that explains some thigns :-)