Workflow to send emails to all account emails, not just primary

I have a workflow working to send an email to the related account email field. However, I require it to send to more than one address in the list of account emails, not just the primary.

Does anyone know how I could accomplish this?

Copy the Send Email Action file from
modules/AOW_Actions/actions/actionSendEmail.php
TO
custom/modules/AOW_Actions/actions/actionSendEmail.php

Then in the custom file, look for function call to sendEmail. Add your logic in the first param for this function call.