We sell customisable items with a variable waiting time of sometimes 3+ months. I need to be able to send transactional (not marketing) emails updating customers on their order and how long the wait will be.
Ideally these emails would be triggered by a tag added to the shopify order.
I've had a look at Klaviyo and a few others but I cant find an easy way to set this up. Shopify flow would work just fine if it allowed us to class these as transactional and not marketing.