Would using an exclusion list with a non-email primary key matching the non-email primary key field in the send list exclude the matching keys, or would the actual sendable email address need to be in both?
I have a data extension that has primary key as a Unique ID and the sendable Email Address is a separate non-primary field. I then have a DE that I want to use as an exclusion list, but this only has the Unique ID in it. Would this still prevent the send on those who have a Unique ID in the exclusion list, or would the email address need to be included on this file?