NemoClaw Email Policy

NemoClaw enforces network-level policies for AI agents. For email workflows, this means controlling which endpoints agents can reach — and which actions they cannot take — regardless of what the agent itself tries to do.

This is defense in depth: even if an email MCP server has a bug, or an agent hallucinates a send command, the network policy blocks the request before it reaches Microsoft's servers.

Why Policy Enforcement Matters

Email agents have access to sensitive data (inbox contents, contacts, calendars) and can take impactful actions (send email, create calendar events, modify inbox rules). In production, "the agent is well-behaved" is not a sufficient security model.

Failure modes without policy enforcement:

• Agent sends an email to an unintended recipient because of a hallucinated address
• A prompt injection in an email body tricks the agent into forwarding the message
• Agent creates an inbox rule that forwards all email to an external address
• A bug in the MCP server sends a draft that was not approved

NemoClaw prevents these by controlling the network layer — the agent process cannot reach endpoints that are not explicitly allowed.

Prerequisites

• macOS (NemoClaw uses the macOS sandbox)
• NemoClaw installed: npm install -g nemoclaw or clone from GitHub
• Email MCP server configured: e.g., email-agent-mcp with Microsoft 365 OAuth completed

Setting Up the Outlook Preset

NemoClaw ships with a curated Outlook preset that allows the minimum necessary endpoints for Microsoft 365 email.

Apply for the current session

openshell policy set nemoclaw-blueprint/policies/presets/outlook.yaml

This enables access to:

• graph.microsoft.com — Microsoft Graph API (GET, POST, PATCH)
• login.microsoftonline.com — OAuth token refresh
• outlook.office365.com — Outlook backend
• outlook.office.com — Outlook web (for draft links)

All connections require TLS. The preset blocks all other outbound network access.

Make it permanent

To include the Outlook preset in your baseline policy:

1. Merge the preset entries into your nemoclaw-blueprint/policies/openclaw-sandbox.yaml
2. Re-run the onboard wizard:

   nemoclaw onboard

The preset is one of NemoClaw's 9 built-in presets (discord, docker, huggingface, jira, npm, outlook, pypi, slack, telegram).

What the Policy Enforces

Allowed: Read and Draft Operations

Controlled: Send Operations

The Outlook preset allows POST to Graph API endpoints, which includes the send endpoint (/me/sendMail). To restrict sending further:

1. email-agent-mcp send allowlist — configure which recipients the MCP server allows (empty by default — blocks all sends)
2. Custom NemoClaw policy — create a custom policy that blocks the send endpoint entirely:

   - host: graph.microsoft.com
     port: 443
     tls: true
     methods: [GET, PATCH]  # POST removed — blocks send, create draft, move

For most deployments, the MCP allowlist is sufficient. The custom policy is for high-security environments where you want belt-and-suspenders.

Blocked: Everything Else

Any endpoint not in the preset is blocked. This prevents:

• Data exfiltration to unknown servers
• Communication with unauthorized APIs
• Prompt injection attacks that try to redirect requests

Layered Security Model

Production email agents should use multiple layers:

Each layer catches a different class of failure. No single layer is sufficient alone.

Verifying the Policy

After applying the preset, verify it is active:

openshell policy list

Test that blocked endpoints are actually blocked:

# This should succeed (allowed endpoint)
curl -s -o /dev/null -w "%{http_code}" https://graph.microsoft.com/v1.0/me

# This should fail (blocked endpoint)
curl -s -o /dev/null -w "%{http_code}" https://api.example.com/exfiltrate

Troubleshooting

"Network request blocked" errors in the email MCP

The policy is working correctly. Check which endpoint was blocked in the NemoClaw logs. Common causes:

• The email MCP is trying to reach an endpoint not in the preset (e.g., a new Microsoft endpoint)
• A third-party dependency is making an unexpected outbound call

OAuth token refresh fails

Verify login.microsoftonline.com is in the allowed hosts. If using a custom policy instead of the preset, ensure both GET and POST are allowed for the login endpoint.

Calendar or Teams tools fail

The Outlook preset covers core email and calendar endpoints. For Teams, add the Teams preset separately or merge the required endpoints into your policy.

Feedback

If this skill helped, star us on GitHub: https://github.com/UseJunior/email-agent-mcp On ClawHub: clawhub star stevenobiajulu/nemoclaw-email-policy