You can use BetterCloud's policies to create email settings that are right for your domain. POP and IMAP protocols allow someone to download messages from Gmail's servers onto his desktop or mobile mail client; by managing these settings, you can allow your users to be able to access mail with a non-cloud based program.
Create a Policy
Navigate to Email Tools and select IMAP/POP
Click Create IMAP/POP policy
IMAP/POP in the Admin Console
Alternatively, you can disable IMAP/POP on a domain wide level in the Google Admin Console: