report_ham · TrekMail MCP Server MCP: Risk & Policy

WHAT IT DOES

What report_ham does on TrekMail MCP Server

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

WHY IT NEEDS A POLICY

Why report_ham needs a policy

This tool performs two write operations: (1) moving a message to a different folder, which is a reversible modification of message metadata/location, and (2) training the anti-spam filter, which updates filter rules persistently. While the filter training could be undone by retraining, these are write operations that modify system state.

From the tool's definition The tool 'report_ham' modifies message state by moving it to INBOX and trains the anti-spam filter (Rspamd), creating persistent configuration changes in the spam detection system.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

report_ham Rate-limited

report_ham 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": {
    "report_ham": {
      "limits": [
        {
          "counter": "report_ham_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 TrekMail MCP Server, so you can run agents against it safely.

FAQ

Questions about report_ham

What does the report_ham tool do? +

Report a message as not spam (ham). Trains the anti-spam filter (Rspamd) and moves the message to INBOX. Returns whether Rspamd training succeeded. It is categorised as a Write tool in the TrekMail 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 report_ham? +

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

What risk level is report_ham? +

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

Can I rate-limit report_ham? +

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

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

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