These are not transactional emails, but triggered emails that are automated by a user's actions. Transactional emails typically revolve around a transaction, example emails include an order confirmation, shipping confirmation, or order cancellation email. I'm pretty sure most of these emails would require the customer to be subscribed to your email list, while a true transactional email would not.

See: https://en.wikipedia.org/wiki/Email_marketing#Transactional_...