To clean up the quarantine folder old quarantined spam or virus messages can be removed. Add the following lines to the crontab to remove each day messages older than 30 days:
# Remove old quarantined messages (>30 days).
# - Spam
0 3 * * * find /var/lib/amavis/virusmails/ -name "spam-*.gz" -mtime +30 -exec rm {} ; >> /var/log/quarantine_cleanup.log 2>&1
# - Bad headers
0 3 * * * find /var/lib/amavis/virusmails/ -name "badh-*" -mtime +30 -exec rm {} ; >> /var/log/quarantine_cleanup.log 2>&1
# - Banned files
0 3 * * * find /var/lib/amavis/virusmails/ -name "banned-*" -mtime +30 -exec rm {} ; >> /var/log/quarantine_cleanup.log 2>&1
# - Virus
0 3 * * * find /var/lib/amavis/virusmails/ -name "virus-*" -mtime +30 -exec rm {} ; >> /var/log/quarantine_cleanup.log 2>&1