unsubscribe_user_by_email

THE RISK

Medium Risk

Why unsubscribe_user_by_email needs a policy

This tool modifies a user's subscription status, which is a reversible write operation (the user can be re-subscribed). It does not delete data permanently, but it does affect marketing communication preferences which can have business impact if misused at scale.

From the tool's definition Unsubscribe a user from a subscription group by email

Documented attack patterns abuse exactly the kind of access unsubscribe_user_by_email gives an agent:

POLICY

How to control unsubscribe_user_by_email

PolicyLayer is an MCP gateway — it sits between your AI agents and Iterable MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for unsubscribe_user_by_email:

policy.json

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

unsubscribe_user_by_email 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.

Create a free account and register Iterable MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

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EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about unsubscribe_user_by_email

What does the unsubscribe_user_by_email tool do? +

Unsubscribe a user from a subscription group by email. It is categorised as a Write tool in the Iterable MCP 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 unsubscribe_user_by_email? +

Register the Iterable MCP Server MCP server in PolicyLayer and add a rule for unsubscribe_user_by_email: 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 Iterable MCP Server. Nothing to install.

What risk level is unsubscribe_user_by_email? +

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

Can I rate-limit unsubscribe_user_by_email? +

Yes. Add a rate_limit block to the unsubscribe_user_by_email 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 unsubscribe_user_by_email completely? +

Set action: deny in the PolicyLayer policy for unsubscribe_user_by_email. 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 unsubscribe_user_by_email? +

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

Enforce policy on every Iterable MCP Server tool call.

Start from Iterable MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →