I am just testing out ISPConfig as I need a cPanel to manage a large number of domains. As email for these domains is already being handled through Google Gmail (<domain_name>@gmail.com) and DNS is handled by Zonomi, I switched off both Mail and DNS under System > Server so just Web, File and DB enabled. However while the links to email and DNS have now gone from the top menu and available modules on the admin home page, I still see a section titled Mailbox Quota and references to email and DNS under accounts limits. Therefore is there a way to remove these?
All account limits are always shown when you activate the account limits dashlet, so the only thing that you could do is to deactive the whole account limit dashlet. The email quota dashlet can be deactivated under system > Interface config.