Hi @dkirkby,
As of the moment, there isn't an option to send an email that contains a message to your employees.
This is because of the email feature for employees in QuickBooks is solely for sending your employee's paycheck.
But don't worry you can email a message to your employees only outside of QuickBooks or your payroll.
As always, you can visit our Help Articles page for QuickBooks Online if in case you need to learn some "How do I" steps.
If there's anything else that I can help you with, please let me know in the comment section down below. I'll be always around ready to help.
