How To Disable Email and DNS tabs?

[tkbailey]

I'm looking for a way to easily remove the Mail and DNS tabs from the ISPConfig web interface (for both the client and the admin). We aren't using this server for DNS or Mail, and would like to remove it to prevent users from thinking they can configure email, when they can't.

Anyway, it seems that the config file I'm looking for is /usr/local/ispconfig/interface/lib/config.inc.php.

I modified the following line to remove 'dns' and 'mail'
define('ISPC_INTERFACE_MODULES_ENABLED', 'mail,sites,dns,tools');

So far it doesn't seem to have any effect.

Am I missing something?