SendHQ
Observable email infrastructure for product teams and AI agents
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.
Best for agent capabilities
Useful in agent tasks
Overview
When to use SendHQ
SendHQ is listed for Email, developer tools, AI infrastructure workflows. 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. Consider it when an agent needs this capability through a documented service boundary instead of custom infrastructure maintained inside the application.
In 4agent’s task model, the product maps to User communication. That makes it a candidate for these tasks: Communicate with users, Automate business workflows.
Integration checklist
- Access: Confirm the api key authentication flow, credential scope, rotation process, and whether calls can be attributed to a user or service identity.
- Client support: No SDK is recorded, so verify the HTTP API or another supported integration path.
- Automation: OpenAPI: listed as available; MCP: not currently recorded; CLI: not currently recorded. Confirm each requirement in the provider's current documentation.
- Operations: Test rate limits, timeouts, retry safety, error payloads, logs, data retention, and the current paid pricing model with production-like volume.
Sources and verification
Use these primary sources to verify current behavior before making an implementation or purchasing decision. Product capabilities, limits, and prices can change after a 4agent listing is reviewed.