The former, but not even the primary details of a registered account; they subscribed the emergency contact email addresses, which for us included one of my board members, who then contacted me saying “why am I getting this noise?”

It was neither an emergency nor a transactional message, making it exactly the kind of behaviour they don’t permit from their own customers. Doubling down with the instruction to unsubscribe oneself could only be interpreted as a “fuck you”, and coming from an email company claiming such a moral high ground as Postmark formerly occupied, a sensational own goal.