Hi jo-blackwell,
I have a few options for you. There is a report called the Pay Slip Report which will allow you to view the pay slips that are published for each pay run:
1. From within your Quickbooks Online Company navigate to the Employee section
2. Select Reports
3. In the first column (Payroll) you will see Pay Slip Report
4. You will then be able to choose the required Pay Run, Employee etc and select Run Report
If you are querying if an email has bounced this can be checked from the Mail Log:
1. Navigate to Payroll Settings
2. Choose Mail Log from the bottom of the middle column
3. Enter the Date Range you are looking for and Filter
For more information please refer to this article: https://support.yourpayroll.com.au/hc/en-au/articles/360000623396-Pay-Slip-Report
Feel free to reach out if you have any other questions at all.
Rebecca