if you have emails on the same partition as /home then they use the same quota and users can't get over the quota
I have moved all the mails from the /var/vmail directory to /home/vmail according this wiki -->
http://wiki.centos-webpanel.com/move-varvmail-to-another-partition but again the user can send and receive mail normally.
Should the mailboxes for every account set to unlimited to follow the rules or have another configuration?
I am struggling to find a solution to this issue as at the same wiki there is the following note
MAIL DISK QUOTA (postfix vmail)
Please note that if you want quota to work for mail then it needs to be on the same partition as user home files.
Is that really works or this is just a false statement and maybe a future feature?