using a dropdown to define email recipient in a form – help please

I've use the solution on the below old thread but does anyone know how I can add multiple email addresses to the {recipient} . I've tried a comma separated list in the text field but that doesn't seem to work, only sending an email through to the first address in the list? https://forum.grabaperch.com/forum/02-25-2015-sending-form-contents-to-different-recipients-based-on-field-selection-in-a-form#reply_form