Mailjet (by Sinch)

Mailjet is an email service provider that combines marketing automation and transactional email sending in one platform. It's known for its intuitive drag-and-drop builder and collaborative features, allowing teams to design and edit emails together. It offers a robust free plan with 6,000 emails/month. Features include segmentation, A/B testing, and detailed analytics. With a strong focus on deliverability and an API for developers, it appeals to both marketers and technical users seeking a unified solution for all outbound email needs.