--quotaugidlimit num--quotaugidlimit num
sets maximum number of user/group IDs in a VE for which disk quota
inside the VE will be accounted. If this value is set to 0, user
and group quotas will not be accounted inside the VE.
Note that if you have previously set value of this parameter to 0,
changing it while the VE is running will not take effect.
Hello,
In another words, it should not be less than a number of users on your server. It has nothing to do with email accounts, just with a number of system accounts.