I'm about to send an email to two data extensions and I'm a bit unsure of myself when it comes to de-duplicating emails. I really don't want to accidentally send people two emails when I send this.
Each extension has a "key" field that has differently formatted data and each has an email field, set to a field-type of "email address".
When two data extensions are selected and the de-duplicate box is ticked, which fields matter in this? Does it only compare the fields set as the "email address"?
Edit: Subscriber Keys are enabled, the de-duplicate box specifies "De-duplicate by email address"