Some time we receive following error message while browsing webmail etc.

Internal Server Error

User ‘test ‘ is over quota

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cpsrvd/11.25  server at xx.xx.xx.xx.

Solution :

To resolve above error refer following steps.
root@server[~]#cd /var/cpanel/overquota/

root@server [/var/cpanel/overquota]#ll | grep your_cpanel_user_name

Once you found out file for your cPanel user name either remove the file or rename it like cpanel_user_name-back etc.

And now browse your webmail but make sure that you have increased disk space for your domain if its really exceeded.