log rolling

i have two logs i would like to roll on a weekly basis, mailaccess.log and secure.log. i know mailaccess.log will roll if i use server admin, but the log is either not recreated or never written to again once its rolled this way. i can't seem to find where to control this in any config file, is it /etc/imapd.conf? i have added this: log_rolling_days: 7 log_rolling_days_enabled: true secure.log is now 10mb, what process controls this? i looked into diskspacemonitor as a option for this, but couldn't get it to work correctly. any advice? thanks