You can disable email instantiation for a case type when case workers no longer need a way to create cases remotely.
In the Explorer panel, click Cases, and then click the case type that you want to open.
On the Settings tab, click Email instantiation.
Only top-level case types support this option.
Clear the Enable email listener check box.
Click Save to stop the listener that monitors your email account.
Standard rules that were created when you enabled email instantiation are not deleted. The next time that your node is restarted, the listener is also restarted, which can result in case creation.