imap_reply_to_email · Email MCP Server MCP: Risk & Policy

WHAT IT DOES

What imap_reply_to_email does on Email MCP Server

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

WHY IT NEEDS A POLICY

Why imap_reply_to_email needs a policy

Replying to an email creates and sends a new message, which is a Write operation. The server description confirms it supports sending emails. The description is empty, lowering confidence slightly, but the tool name strongly implies sending/writing an email reply. Severity is high because an AI agent misusing this tool could send unauthorized emails on behalf of the user across multiple accounts.

From the tool's definition Tool name 'imap_reply_to_email' — the 'reply' action implies composing and sending an email response, which is a write/send operation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

imap_reply_to_email Rate-limited

imap_reply_to_email 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": {
    "imap_reply_to_email": {
      "limits": [
        {
          "counter": "imap_reply_to_email_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 Email MCP Server, so you can run agents against it safely.

FAQ

Questions about imap_reply_to_email

What does the imap_reply_to_email tool do? +

imap_reply_to_email. It is categorised as a Write tool in the Email 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 imap_reply_to_email? +

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

What risk level is imap_reply_to_email? +

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

Can I rate-limit imap_reply_to_email? +

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

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

imap_reply_to_email is provided by the Email MCP Server MCP server (sventern/mcp_email). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.