Our customers request to be on an email list letting them know about important product updates. Unfortunately, about 40% of customers on that list are not receiving our emails.
We are working with one customer in particular who has confirmed for us that we are not appearing in the Spam box, yet nobody at her organization is receiving any email communications from us.
All emails appear as "Sent" and "Delivered" in Marketo.
Is there anything we can do on our end? What can our customers do?