If your company has audit log reports enabled, you'll be receiving them every day, week, or month, depending on the way you set up the frequency. 

Audit log reports contain the list of the following actions:

• SIMPLE_SEARCH
• ADVANCED_SEARCH
• VIEW_EMAIL
• SOCIAL_MEDIA_SEARCH
• failed LOGIN actions

To schedule reports, go to the Audit Log section and click Schedule Reports on the far right. Note that this button will be visible only if the audit log reports are enabled for your company. The reports are sent to the Account Admins.

Once you click the Schedule Reports button, you'll be able to set the frequency of reports to:

• Monthly
• Weekly
• Daily
• Disabled (in case you don't want to receive any audit log reports)