convert_mailbox_to_shared · TrekMail MCP Server MCP

WHAT IT DOES

What convert_mailbox_to_shared does on TrekMail MCP Server

AI agents use convert_mailbox_to_shared 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 convert_mailbox_to_shared needs a policy

This tool modifies mailbox properties and access patterns (converting ownership model, rotating credentials, changing access method) but does not delete data or destroy the mailbox itself. The changes are technically reversible—the mailbox can be converted back to a regular mailbox and credentials can be reset.

From the tool's definition The tool description explicitly states it 'Convert[s] an existing regular mailbox into a shared (team) mailbox' and 'rotates the mailbox password and ends direct login for the original owner.' These are reversible structural modifications to mailbox…

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

convert_mailbox_to_shared Rate-limited

convert_mailbox_to_shared 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": {
    "convert_mailbox_to_shared": {
      "limits": [
        {
          "counter": "convert_mailbox_to_shared_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 convert_mailbox_to_shared

What does the convert_mailbox_to_shared tool do? +

Convert an existing regular mailbox into a shared (team) mailbox. The specified members are added immediately. IMPORTANT: this operation rotates the mailbox password and ends direct login for the original owner — the mailbox is henceforth accessed only through the members. 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 convert_mailbox_to_shared? +

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

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

Can I rate-limit convert_mailbox_to_shared? +

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

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

convert_mailbox_to_shared 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.