Sinch Mailjet is a platform offering an email delivery service for marketing and developer teams. It helps businesses overcome the challenges of email deliverability and provides a platform for creating, sending, and analyzing email campaigns. One of the key problems that Sinch Mailjet solves is ensuring that marketing emails reach the intended recipients' inboxes. It offers features like real-time collaboration, A/B testing, and segmentation to optimize email campaigns and improve deliverability.