We used to request granular auto-clean settings every time there was a beta and just gave up on the request.  It would be great if you could give the user the ability to control auto clean on inbox and user folders but still disable the ability on certain folders like spam and deleted.

Hello,

 

Users can auto-clean their Inbox as long as it's allotted by the System Administrator. As the admin, log in and go to Settings > Storage > Folder Auto-Clean. On the Options tab, enable both settings for "Allow domains to override auto-clean settings" and "Allow users to auto-clean inbox." Now, when you change your auto-clean setting as a user, you'll have the option to select the Inbox. 
 
Thanks!