liara_stop_mail_server

THE RISK

High Risk

Why liara_stop_mail_server needs a policy

Stopping a mail server is an Execute action—it initiates an external operation with real-world effects (halting mail delivery and services). While the operation is theoretically reversible (by starting the server again), it causes immediate disruption to email services and dependent systems.

From the tool's definition Tool name and description: 'liara_stop_mail_server' with action to 'Stop a mail server'. This triggers an operational state change on infrastructure.

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

POLICY

How to control liara_stop_mail_server

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

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "liara_stop_mail_server": {
      "limits": [
        {
          "counter": "liara_stop_mail_server_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

liara_stop_mail_server stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

Create a free account and register Liara 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.

RATE-LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

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All 108 Liara MCP Server tools →

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Go deeper

High-risk tools in Liara MCP Server → Every high-risk tool this server exposes, in one view.
All high-risk MCP tools → Every high-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Agent sandbox → Bounding what an agent can execute and where the boundary should sit.
Least privilege for MCP → Granting agents the minimum tool surface the task needs.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about liara_stop_mail_server

What does the liara_stop_mail_server tool do? +

Stop a mail server. It is categorised as a Execute tool in the Liara MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on liara_stop_mail_server? +

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

What risk level is liara_stop_mail_server? +

liara_stop_mail_server is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit liara_stop_mail_server? +

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

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

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

Enforce policy on every Liara MCP Server tool call.

Start from Liara 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 →