SendHQ is an email API for verified-domain transactional sending, inbound email, delivery events, scoped API keys, and observable agent workflows.

Comprehensive overview of features and capabilities
SendHQ gives product teams and AI agents one coherent email workflow: verify domains, send transactional messages, receive email, inspect delivery outcomes, and manage workspace-scoped API keys. Its public REST surface is designed for serious product communication with clear observability and sender-safety controls.
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https://sendhq.cc