I am new to Marketo, and currently setting up a series of emails to onboard new customers to a product. There are 5 emails in the series at the moment, and we are wanting to have them 5 working days apart. Customers will be continuously added to the programe from a overnight batch file upload, where I see using a filter on "product = x", "start date = yesterday". If we do modify the content or add another email in, I do not see the requirement to send this email to the customer, if they have finished the series.
My question is, is it best to do this as a nurture or a trigger campaign.