Email for OpenClaw AI Agents

The Problem

OpenClaw agents are built to work autonomously — researching, summarizing, scheduling, negotiating. But the moment they need to communicate with a human over email, things get complicated. Most developers reach for transactional email services like SendGrid or Resend, only to discover that those tools are built for one-way notifications, not two-way conversations.

The core problem is that agents need mailboxes, not just sending endpoints. They need to send an email, receive a reply, understand the thread context, and respond again — all without a human in the loop. Setting up a mail server to do this is a multi-week project involving DNS records, SMTP configuration, IMAP polling, spam filtering, and ongoing maintenance.

Even if you get it working, you are now running email infrastructure instead of building your agent. Every hour spent debugging DKIM alignment or postfix relay rules is an hour not spent on the agent logic that actually matters.

How an Agent Solves This

Consider a research agent built on OpenClaw. A user asks it to compile a competitive analysis. The agent gathers data from multiple sources, drafts a summary, and emails it to a stakeholder. The stakeholder replies with a follow-up question. The agent reads the reply, runs another analysis, and sends an updated report — all within the same email thread.

This pattern shows up everywhere in agentic workflows:

• A scheduling agent emails attendees, handles RSVPs and reschedule requests
• A procurement agent negotiates with vendors over email, tracking concessions across threads
• A monitoring agent sends incident reports and collects acknowledgments from on-call engineers
• An HR onboarding agent walks new hires through paperwork, answering questions as they come

Each of these needs a dedicated email address, reliable delivery, and a way to process inbound messages programmatically. The agent should not need to care about MX records or TLS certificates — it should call an API and get on with its job.

How It Works with Robotomail

Robotomail is purpose-built for this. You provision a mailbox for your agent with a single API call, register a webhook for inbound email, and your agent is ready to send and receive. Here is the complete setup flow.

1. Create a mailbox

Each agent gets its own mailbox with a dedicated email address. You can use your custom domain or the built-in robotomail.co platform domain.

# Create a mailbox for your agent
curl -X POST https://api.robotomail.com/v1/mailboxes \
  -H "Authorization: Bearer rm_live_abc123" \
  -H "Content-Type: application/json" \
  -d '{
    "address": "research-agent",
    "displayName": "Research Agent",
    "domainId": "dom_abc123"
  }'

# Response
{
  "id": "mbx_7f3k9x",
  "address": "[email protected]",
  "displayName": "Research Agent",
  "dailySendLimit": 1000,
  "dailySendCount": 0
}

2. Send email

Your agent sends email through the REST API. Robotomail handles DKIM signing, SPF alignment, and SMTP delivery. Threading is automatic — In-Reply-To and References headers are set when replying to an existing thread.

# Agent sends an email
curl -X POST https://api.robotomail.com/v1/mailboxes/mbx_7f3k9x/messages \
  -H "Authorization: Bearer rm_live_abc123" \
  -H "Content-Type: application/json" \
  -d '{
    "to": ["[email protected]"],
    "subject": "Research Summary: Q1 Market Analysis",
    "bodyText": "Hi Jane, here is the summary you requested...",
    "bodyHtml": "<p>Hi Jane, here is the summary you requested...</p>"
  }'

3. Receive replies via webhook

Register a webhook and Robotomail will POST inbound messages to your agent's endpoint in real time. Each payload includes the full message content, sender details, and threadId for conversation context. Payloads are signed with HMAC-SHA256 via the X-Robotomail-Signature header so your agent can verify authenticity.

# Register a webhook for inbound email
curl -X POST https://api.robotomail.com/v1/webhooks \
  -H "Authorization: Bearer rm_live_abc123" \
  -H "Content-Type: application/json" \
  -d '{
    "url": "https://your-agent.example.com/hooks/email",
    "events": ["message.received"],
    "mailboxId": "mbx_7f3k9x"
  }'

# Robotomail POSTs to your endpoint when email arrives
{
  "event": "message.received",
  "data": {
    "id": "msg_9xk2m4",
    "mailboxId": "mbx_7f3k9x",
    "from": { "email": "[email protected]", "name": "Jane" },
    "subject": "Re: Research Summary: Q1 Market Analysis",
    "text": "Thanks, can you dig deeper into the APAC numbers?",
    "threadId": "thr_8v2n5p"
  }
}

Key Benefits

• One mailbox per agent. Each agent gets a dedicated email address. No shared inboxes, no routing logic on your side. Provision as many as you need via API.
• Full send and receive. Not just outbound notifications — agents can receive replies and continue conversations across threads.
• Automatic threading. Robotomail tracks threads using In-Reply-To and References headers, with subject-line fallback. Your agent always knows where a message fits in a conversation.
• Zero mail-server ops. DNS records, DKIM, SPF, DMARC, TLS, spam filtering — all handled. You call the API, Robotomail runs the infrastructure.
• Works with any framework. Robotomail is a REST API. It works with OpenClaw, LangChain, CrewAI, AutoGen, or any custom agent framework. If your agent can make an HTTP request, it can send email.

Read the full API documentation to explore all endpoints, or check out the launch post for the story behind Robotomail. Sign up free and have your first agent sending email in under five minutes.