Settings - Folder Auto-Clean
Folder Auto-Clean is a method for limiting how much of your account disk space is used by the Junk E-Mail, Sent Items, and Deleted Items folders. By placing limits on the size of these folders, you can help ensure that your account does not fill up unnecessarily. Oldest messages will be deleted from the folders first.
Note: Depending on the policies your administrator has established, you may or may not be able to change the settings on this page.
Note: If auto-clean is active on a folder, messages will get deleted from it eventually, so do not keep messages in that folder if you want to keep them.
Use default auto-clean settings - Choosing this option will let you adopt the policy of your email host or domain administrator. If the administrator changes the policy, yours will automatically change with it.
Override auto-clean settings for this account - Choose this option to override the settings. Any changes you make will not be affected if the administrator changes the policy, unless they disable user overrides.
The following options appear once for each folder that can be auto-cleaned.
Enable auto-clean for this folder - If this box is checked, then auto-clean will be active for the specified folder.
Folder size BEFORE auto-clean - Once the folder reaches this size (in megabytes), the auto-clean process is started, and older messages are cleaned.
Folder size AFTER auto-clean - This is the goal size for the auto-clean process. It will try to delete older messages until the folder gets to this size. This number should always be lower than the "before" number.