Helo

Meet Helo

Helo is an email delivery service for developers who need to send messages from an application. It supports both an API and SMTP, making it possible to integrate with existing sending code or build a new workflow around its endpoints. The service separates transactional and promotional traffic so different kinds of mail can be managed independently.

For platforms that send on behalf of customers, Helo provides isolated sending for each tenant and tools for using customer-owned domains. Its focus is on managing the delivery and reputation problems that arise as an application grows. Usage-based pricing lets a team connect its sending costs to the amount of email it actually processes.