Bummer, I just tried several other steps similar. but seems the email step cannot have a blank string during the email step.
I will need to consult with the customer, this may be a big problem, looping through to send many emails, for thousands of invoices a day, is going to really swamp their mail server. Would be much better to just send 1 time, with multiple entries.
My current failed attempt, added each email to a single GV, and attempted to send, that is when I realized the empty GV would cause an error. Docuware Devs, if you see this, please allow a way to send a list of emails. seems like this would be much easier to solve on a Dev side..
Thanks for the reply.