mailplus_get_message

THE RISK

Low Risk

Why mailplus_get_message needs a policy

This tool retrieves and reads email message content and optionally downloads attachments. It does not create, modify, delete, or execute operations—it only accesses existing data. Even attachment download is a retrieval operation without side effects. Severity is low because misuse would expose sensitive email content but would not alter, delete, or commit financial actions.

From the tool's definition Tool name 'mailplus_get_message' and description 'Get the full content of a MailPlus email message, with optional attachment download' both indicate retrieval without modification. The verb 'Get' and 'download' are read operations.

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

POLICY

How to control mailplus_get_message

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

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "mailplus_get_message": {}
  }
}

mailplus_get_message is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

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

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

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Read tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about mailplus_get_message

What does the mailplus_get_message tool do? +

Get the full content of a MailPlus email message, with optional attachment download. It is categorised as a Read tool in the Synology Office MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on mailplus_get_message? +

Register the Synology Office MCP server in PolicyLayer and add a rule for mailplus_get_message: 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 Synology Office. Nothing to install.

What risk level is mailplus_get_message? +

mailplus_get_message is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit mailplus_get_message? +

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

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

mailplus_get_message is provided by the Synology Office MCP server (vocweb/synology-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 Synology Office tool call.

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

CHECK YOUR STACK →