Mailjet

Mailjet is a unique platform that serves a dual purpose: a user-friendly marketing email tool and a robust transactional email API for developers. It's part of the Sinch ecosystem. For marketers, it offers a drag-and-drop editor, automation, and campaign management. Its key differentiator is catering to both marketing teams and technical teams within the same company, allowing seamless management of promotional and transactional emails (like receipts and passwords).

It's best for tech-savvy small businesses, SaaS companies, and developers who need to manage both marketing and transactional emails from a single, reliable service.