Mailbox full issue

Hi,

Lately with new update, having issue with mailbox. The old version if mailbox full it's will bounce the email.

But with new update, it will hold but cpanel not checking either mailbox is already cleanup or not. When we saw queue high on exim, we check on exim log we can catch the error "Mailbox is full / Blocks limit exceeded / Inode limit exceeded" but when we check on cpanel/whm mailbox user still have space.

We suspect this is a bug. If this a bug, please fix it and provide new patch.

Code:

root@mymail [~]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/vg_mail-lv_root
                       50G   32G   15G  68% /
tmpfs                 7.2G     0  7.2G   0% /dev/shm
/dev/sda1             477M  104M  348M  23% /boot
/dev/mapper/vg_mail-lv_home
                      682G  420G  228G  65% /home
/usr/tmpDSK           1.2G   73M  1.1G   7% /tmp
root@mymail [~]# df -i
Filesystem             Inodes   IUsed    IFree IUse% Mounted on
/dev/mapper/vg_mail-lv_root
                      3276800 1057533  2219267   33% /
tmpfs                 1866611       1  1866610    1% /dev/shm
/dev/sda1              128016      53   127963    1% /boot
/dev/mapper/vg_mail-lv_home


                     45375488 1725877 43649611    4% /home
/usr/tmpDSK             79200    1643    77557    3% /tmp

You can see, we have plenty space with inode free.Advice needed.

Thanks.