# run_smtp_user_enum

A execute tool on the Pentester-MCP MCP server.

Agent View of the PolicyLayer registry record for `run_smtp_user_enum`. HTML page: https://policylayer.com/tools/halilkirazkaya-pentester-mcp/run-smtp-user-enum

## Facts

- Tool: `run_smtp_user_enum`
- Server: Pentester-MCP (`halilkirazkaya/pentester-mcp`) — https://policylayer.com/tools/halilkirazkaya-pentester-mcp.md
- Homepage: https://github.com/halilkirazkaya/pentester-mcp
- Risk category: Execute (High risk)
- Registry record: grade F, identity unverified
- Server rate-limited: no
- Parameters: 0
- Recommended policy verdict: Rate-limited

## Example call (MCP tools/call, JSON-RPC 2.0)

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "run_smtp_user_enum",
    "arguments": {}
  }
}
```

## Why run_smtp_user_enum is rated High

This tool executes external reconnaissance operations (SMTP probing) whose effects depend on target arguments (server address, usernames to test). It is not merely reading cached data (Read), nor creating reversible artifacts (Write), nor destroying data (Destructive). It actively triggers network interactions and scans against remote systems, making it Execute category.

From the tool's own definition: "Tool name 'run_smtp_user_enum' indicates execution of SMTP user enumeration, a reconnaissance technique that connects to SMTP servers and probes for valid usernames."

## Use case

AI agents invoke run_smtp_user_enum to trigger actions in Pentester-MCP. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call: builds kicked off, notifications sent, workflows started.

## Recommended policy (PolicyLayer)

Verdict: **Rate-limited**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches Pentester-MCP:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "run_smtp_user_enum": {
      "limits": [
        {
          "counter": "run_smtp_user_enum_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}
```

## Other tools on Pentester-MCP (336)

- `dnscat_client` — Execute — https://policylayer.com/tools/halilkirazkaya-pentester-mcp/dnscat-client.md
- `execute_weevely_module` — Execute — https://policylayer.com/tools/halilkirazkaya-pentester-mcp/execute-weevely-module.md
- `generate_weevely_agent` — Execute — https://policylayer.com/tools/halilkirazkaya-pentester-mcp/generate-weevely-agent.md
- `identify_hash` — Execute — https://policylayer.com/tools/halilkirazkaya-pentester-mcp/identify-hash.md
- `john_prepare` — Execute — https://policylayer.com/tools/halilkirazkaya-pentester-mcp/john-prepare.md
- `launch_xsser_gui` — Execute — https://policylayer.com/tools/halilkirazkaya-pentester-mcp/launch-xsser-gui.md
- `manage_brew` — Execute — https://policylayer.com/tools/halilkirazkaya-pentester-mcp/manage-brew.md
- `manage_dirb_dictionaries` — Execute — https://policylayer.com/tools/halilkirazkaya-pentester-mcp/manage-dirb-dictionaries.md
- `manage_mounts` — Execute — https://policylayer.com/tools/halilkirazkaya-pentester-mcp/manage-mounts.md
- `manage_sliver_daemon` — Execute — https://policylayer.com/tools/halilkirazkaya-pentester-mcp/manage-sliver-daemon.md
- `manage_wpprobe` — Execute — https://policylayer.com/tools/halilkirazkaya-pentester-mcp/manage-wpprobe.md
- `monitor_fping` — Execute — https://policylayer.com/tools/halilkirazkaya-pentester-mcp/monitor-fping.md
- `objection_explore` — Execute — https://policylayer.com/tools/halilkirazkaya-pentester-mcp/objection-explore.md
- `objection_patch` — Execute — https://policylayer.com/tools/halilkirazkaya-pentester-mcp/objection-patch.md
- `run_403bypasser` — Execute — https://policylayer.com/tools/halilkirazkaya-pentester-mcp/run-403bypasser.md
- `run_addcomputer` — Execute — https://policylayer.com/tools/halilkirazkaya-pentester-mcp/run-addcomputer.md
- `run_aircrack_action` — Execute — https://policylayer.com/tools/halilkirazkaya-pentester-mcp/run-aircrack-action.md
- `run_aix` — Execute — https://policylayer.com/tools/halilkirazkaya-pentester-mcp/run-aix.md
- `run_alterx` — Execute — https://policylayer.com/tools/halilkirazkaya-pentester-mcp/run-alterx.md
- `run_amass` — Execute — https://policylayer.com/tools/halilkirazkaya-pentester-mcp/run-amass.md
- `run_apktool` — Execute — https://policylayer.com/tools/halilkirazkaya-pentester-mcp/run-apktool.md
- `run_arachni` — Execute — https://policylayer.com/tools/halilkirazkaya-pentester-mcp/run-arachni.md
- `run_arjun` — Execute — https://policylayer.com/tools/halilkirazkaya-pentester-mcp/run-arjun.md
- `run_asnmap` — Execute — https://policylayer.com/tools/halilkirazkaya-pentester-mcp/run-asnmap.md
- `run_atexec` — Execute — https://policylayer.com/tools/halilkirazkaya-pentester-mcp/run-atexec.md
- `run_autobloody` — Execute — https://policylayer.com/tools/halilkirazkaya-pentester-mcp/run-autobloody.md
- `run_autorecon` — Execute — https://policylayer.com/tools/halilkirazkaya-pentester-mcp/run-autorecon.md
- `run_awk` — Execute — https://policylayer.com/tools/halilkirazkaya-pentester-mcp/run-awk.md
- `run_bbot` — Execute — https://policylayer.com/tools/halilkirazkaya-pentester-mcp/run-bbot.md
- `run_binwalk` — Execute — https://policylayer.com/tools/halilkirazkaya-pentester-mcp/run-binwalk.md
- …and 306 more: https://policylayer.com/tools/halilkirazkaya-pentester-mcp.md

## For agents

This record is a snapshot. Live verdicts and the full registry:

- Check every server in your MCP config at once: `npx -y policylayer stack`
- Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md)
- Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events`

---

Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=halilkirazkaya-pentester-mcp · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/halilkirazkaya-pentester-mcp