Hi, As you would have seen the documentation: https://docs.adobe.com/content/help/en/campaign-standard/using/communication-channels/transactional-messaging/event-transactional-messages.htmland https://docs.adobe.com/content/help/en/campaign-standard/using/communication-channels/transactional-messaging/profile-transactional-messages.htmlBoth types of Transaction emails different purposes.1. Profile type should be used when you have a unique key with you when a certain event happens and you know t...