SendHQ

SendHQ gives product teams and AI agents one coherent email workflow. Teams can verify sending domains, send transactional messages, receive inbound email, inspect delivery outcomes, and manage workspace-scoped API keys from one service. Its public REST API is designed for serious product communication with clear observability and sender-safety controls. SendHQ supports both application developers and agent builders that need a predictable interface for outbound and inbound email without stitching together separate tools. Public API documentation and an OpenAPI specification make integration straightforward, while verified-domain sending and delivery-event visibility help teams operate responsibly. SendHQ is a paid subscription product with plans starting at $9 per month; it does not claim a free tier or trial.