Head on to the Reports tab in the main menu
A new kind of Email activity management report which will help you to keep track of the emails that you have sent to your tenants
Once you hit on the Email activity report, you do have the option to choose the time line(Date range) and hit on Get Report.
You will be able to see this report once you send across any kind of email to your tenants from 6Storage.
This will give you an extensive data to understand the status if your tenants have received any invoices/ reminders. It also stands as a proof that you have sent it across to your tenants and they have received it or not.