Yes I did and I'd even went to deleted everything but still don't show near "0".1. How do you do that? In console or in directadmin?
Direct admin
2. How do check size? In console or in directadmin?
Direct admin
3. Did you try to clear "Imap Folders"?
Directadmin user level login
User Stats Page (/CMD_USER_STATS?domain=domain.com) => Total Disk Usage (MB) => Update
pop_disk_usage_cache=1