Part of the reason is these /opt/zimbra/log/access_log.TIMESTAMP logs are not rotating or compressing. I can't seem to determine what config file these are managed by. None of the log pruning rules in crontab seem to apply, and the zmcompresslogs is not compressing them.

Code:
# Log pruning
#
25 2 * * *  find /opt/zimbra/log/ -type f -name \*.trace.log\* -mtime +1 -exec rm {} \; > /dev/null 2>&1
30 2 * * * find /opt/zimbra/log/ -type f -name \*.log\* -mtime +5 -exec rm {} \; > /dev/null 2>&1
35 2 * * * find /opt/zimbra/log/ -type f -name \*.out.???????????? -mtime +5 -exec rm {} \; > /dev/null 2>&1
#
# compress logs manually to avoid application pauses when
# handled through the log4j thread
#
50 2 * * * /opt/zimbra/libexec/zmcompresslogs > /dev/null 2>&1
I can add an additional cron pruning entry to catch these access_log.TIMESTAMP files, but I'm not sure why zmcompresslogs is not doing anything with them.

Matt