Default account disk usage and thousands of hidden directories

Hello, this is to do with a default account appearing to occupy more space than it does. The default email account contains all of about 18 emails ranging from 1kB to 10kB size, and should actually occupy no more than about ~60kB. So where does the 917MB come from? I manually added up the used amounts across all mail accounts listed in cPanel and can find about 9GB du command on the server shows even higher du --max-depth=1 -h /home/user/mail 11G Why are there thousands of hidden files? ls -a | wc -l 13272 example hidden directories 24K /home/user/mail/.info.cur.1569460099_M{number}P{number}_{cpanel_server_address},S={number},W={number}:2,S 24K /home/user/mail/.info.cur.1526601888_M{number}P{number}_{cpanel_server_address},S={number},W={number}:2,S All seem to contain empty directories and dovecot files. ls /home/user/mail/.info.cur.1569460099_M{number}P{number}_{cpanel_server_address},S={number},W={number}:2,S . .. cur dovecot.index.log dovecot-uidlist new tmp ... again, there are thousands of this hidden directories, all for no more than about 30 email accounts total..... The two largest accounts only occupy about 4G and 2G respectively. Is it safe to delete all these seemingly useless .acc.cur.* directories? Quota used on the account

Location	Size (MB)	Disk Usage
Files in home directory.	1.91 MB
Files in hidden subdirectories.	41.70 MB
bin/	0.00 MB
cache/	0.07 MB
cpmove.psql/	0.00 MB
sub-account	0.00 MB
etc/	12.45 MB
fantastico_backups/	0.01 MB
logs/	4.69 MB
perl/	0.00 MB
perl5/	0.00 MB
php/	0.08 MB
public_ftp/	0.00 MB
public_html/	528.61 MB
ssl/	0.47 MB
tmp/	455.66 MB
var/	0.01 MB
MySQL	313.62 MB
Mailing Lists	0.00 MB
Email Archives	1.66 MB	* Contained in the mail directory.
Email Accounts	10,976.36 MB	* Contained in the mail directory.
	12,335.64 MB total disk space used.
	15,880.00 MB quota limit (11,894.44 MB used).

Default account quota in cPanel

Default

Unrestricted

917.17 MB / ?