Email API for Developers and AI Agents | SendHQ

What

SendHQ is an email API and management platform designed to unify transactional messages, inbound support, marketing, and autonomous AI agent communications under a single infrastructure layer. It solves email stack sprawl by allowing engineering teams to run multiple domains, dedicated inboxes, and scoped sending identities through one consolidated interface and REST API. The platform positions itself as a universal email layer for modern applications, services, and AI assistants, replacing fragmented setups across different third-party vendors.

Features

• Multi-Domain Identity Routing: Supports dozens to hundreds of verified domains within one workspace, allowing distinct applications, services, and agents to maintain isolated sending and receiving identities.
• Unified Send and Receive API: Implements a direct REST interface and inbound webhooks for receipts, notifications, and threaded replies, eliminating the need for separate transactional and support tools.
• Model Context Protocol (MCP) Support: Provides a dedicated MCP server connection for assistants such as Claude, ChatGPT, and Muse to read inboxes, explain bounces, check deliverability, and send emails via natural language prompts.
• Deliverability and Reputation Monitoring: Tracks delivery, bounce, and complaint metrics in real time, backed by an automated enforcement rule that suspends accounts with bounce or complaint rates exceeding 3% for two consecutive weeks.
• Pluggable Mail Architecture: Operates on Amazon SES by default while using an underlying pluggable layer to let infrastructure teams swap providers via configuration rather than application rewrites.

Helpful Tips

• Enforce Strict List Hygiene: Monitor bounce and complaint metrics closely to remain well below the mandatory 3% two-week threshold that triggers automatic account suspension.
• Implement Approval Workflows for Agents: Configure assistant and MCP tool permissions to require human verification before executing outgoing sends or deleting data.
• Validate DNS Authentications Early: Generate and apply the platform's provided SPF, DKIM, and DMARC records during initial domain setup to verify identities before routing production volume.
• Map Plan Types to Traffic Needs: Choose explicitly between transactional and marketing modes across the Starter (50,000 emails/month) or Scale (200,000 emails/month) tiers based on the nature of the application's outbound workloads.

OpenClaw Skills

The documentation specifically identifies OpenClaw as a supported agent environment, noting that integration requires a server-side adapter to interface with SendHQ's REST API and map provider-specific fields. In a plausible OpenClaw deployment, developers could build autonomous customer-ops skills where agents monitor dedicated inboxes, parse customer queries, retrieve relevant application data, and dispatch transactional replies or escalated alerts under scoped product identities. Combining OpenClaw's orchestration with SendHQ's multi-domain routing enables software companies to deploy autonomous, multi-brand email agents while retaining centralized outbox auditing and human-takeover controls.