SendHQ

SendHQ is an email API built for product teams — and, unusually, for AI agents acting on their behalf. It combines outbound transactional sending, inbound email handling, delivery event visibility, verified domain management and workspace-scoped API keys in a single API, so the whole email lifecycle lives in one place rather than being split across a sending service and a separate inbound provider. The scoped API keys are the detail that signals the intended audience: you can hand an agent or a service a key limited to one workspace instead of your whole account, which is the right security posture for automated workflows. Delivery event visibility means you can see what happened to a message without spelunking logs. It is a paid, developer-facing product — this is infrastructure you integrate, not an app you click around — so the evaluation criterion is the API surface and deliverability rather than a UI. For teams wiring email into products or agent pipelines, the combined inbound-plus-outbound scope saves a real integration.