sendTextEmail · MCP Email Server MCP: Risk & Policy

WHAT IT DOES

What sendTextEmail does on MCP Email Server

AI agents use sendTextEmail to create or update resources in MCP Email Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your MCP Email Server environment.

WHY IT NEEDS A POLICY

Why sendTextEmail needs a policy

Sending emails is a Write category action as it creates new data (email messages) and sends them to recipients. While reversible in principle (recipient can delete), the action itself cannot be undone once sent. Severity is high because an AI agent misusing this could spam, phish, or impersonate users at scale, causing reputational and operational damage.

From the tool's definition Tool name 'sendTextEmail' and description 'Send a plain text email' indicate the tool creates and sends email messages, a reversible write operation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

sendTextEmail Rate-limited

sendTextEmail stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "sendTextEmail": {
      "limits": [
        {
          "counter": "sendtextemail_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches MCP Email Server, so you can run agents against it safely.

FAQ

Questions about sendTextEmail

What does the sendTextEmail tool do? +

Send a plain text email. Attachments: list of local file paths like [. It is categorised as a Write tool in the MCP Email Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on sendTextEmail? +

Register the MCP Email Server MCP server in PolicyLayer and add a rule for sendTextEmail: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches MCP Email Server. Nothing to install.

What risk level is sendTextEmail? +

sendTextEmail is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit sendTextEmail? +

Yes. Add a rate_limit block to the sendTextEmail rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block sendTextEmail completely? +

Set action: deny in the PolicyLayer policy for sendTextEmail. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides sendTextEmail? +

sendTextEmail is provided by the MCP Email Server MCP server (ptbsare/email-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.