Salesforce – Lead Settings: Lead Queue Settings

The queue or user that will own a lead when assignment rules fail to locate an owner.

Setup > Customize > Leads > Settings

The user or queue to which leads will be assigned if the active assignment rule fails to locate an owner. This applies to leads Default Lead Owner captured online and leads that a user manually creates or edits with the auto-assign checkbox enabled.

Notify Default Lead owner: Select the option if you want to notify the user when the lead is assigned to the him or her.