Mailjet vs Postfix: What are the differences?
Mailjet: Email delivery made easy. Mailjet is a real-time Cloud Emailing platform: scalable, agile and flexible. Our unique algorithm boosts your deliverability and our platform provides in-depth insight so you can optimize more than ever; Postfix: A free and open-source mail transfer agent. It is a free and open-source mail transfer agent that routes and delivers electronic mail. It is Wietse Venema's mail server that started life at IBM research as an alternative to the widely-used Sendmail program. Now at Google, Wietse continues to support it.
Mailjet and Postfix can be categorized as "Transactional Email" tools.