There are many kinds of transactional emails. The most famous ones are: . alerts related to the user’s account; . notifications related to abandoned carts; . relevant notifications, such as event dates or products sent to shipping; . order confirmation;  . purchase receipts; . responses to subscriber’s requests, doubts, and complaints; . notifications related to passwords; . requests related to feedback; . birthday cards or milestones emails; . welcome and thank-you notes. All emails that are considered to be a one-on-one conversation can be put into the transactional emails category.