Need email alerts on low disk space in Office 365 SharePoint
Configure email alert per site for Site Collection Administrators.
- Log into Office 365 admin portal. https://portal.office.com/Admin
- Expand ADMIN in the left pane and select SharePoint
- On the Manage site collections page select the site that you would like alerts on and click on the Storage Quota button
- On the Set storage quota screen you will need to check the Send e-mail to site collection administrators when a site collection’s storage reaches: check box and place the percentage at which you wish to get the alert click save and all Site Collection Administrators will receive this alert.