set_auto_reply · TrekMail MCP Server MCP: Risk & Policy

WHAT IT DOES

What set_auto_reply does on TrekMail MCP Server

AI agents use set_auto_reply 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 set_auto_reply needs a policy

This tool modifies mailbox auto-reply configuration (subject, body, date range, mailing list filtering), which is reversible and represents a Write action. It lacks the destructive nature of deletion, the irreversibility of destructive operations, or the external execution hazards of Execute tools.

From the tool's definition Tool configures and sets auto-reply settings for a mailbox with custom subject and message body, which modifies mailbox configuration reversibly. Description uses 'Configure' and 'Set' indicating data modification.

Risk signalsBulk/mass operation — affects multiple targets

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

set_auto_reply Rate-limited

set_auto_reply 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": {
    "set_auto_reply": {
      "limits": [
        {
          "counter": "set_auto_reply_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 set_auto_reply

What does the set_auto_reply tool do? +

Configure the vacation auto-reply for a mailbox. Set a custom subject, message body, optional date range, and whether to skip mailing lists. Each sender receives the reply at most once every 7 days. Starter, Pro, and Agency plans. 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 set_auto_reply? +

Register the TrekMail MCP Server MCP server in PolicyLayer and add a rule for set_auto_reply: 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 set_auto_reply? +

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

Can I rate-limit set_auto_reply? +

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

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

set_auto_reply 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.