If you are a site Owner on SharePoint Online and Office 365, you will receive emails asking you to take action on a site or Office 365 group once it becomes unused. Email notifications are not available for on-premises environments.
An Owner will receive one email for each site/group. The email asks the Owner what action they want to take on the object. Emails are sent each Thursday at 8:00am (in the timezone of the tenant).
Emails always come from firstname.lastname@example.org, if you receive an alert from another source please flag it to us and delete it.
Once you receive the email, you can confirm whether you still need the site/group, or whether you are done with it.
The Administrator is notified of your decision, and will take action accordingly.
Note: If your site has multiple Owners, each Owner will receive the same email. Sharegate only needs one response, and the first Owner to reply will trigger the notification to the Administrator, and you will not receive another email regarding that site.