send_mail

THE RISK

Medium Risk

Why send_mail needs a policy

This tool creates/sends email messages, which is a reversible write operation. In the context of an AFIP (Argentine tax authority) server, misuse could send unwanted communications to taxpayers or authorities, but emails can be recalled or ignored, making it Write rather than Destructive.

From the tool's definition Tool name 'send_mail' and description 'Send an email via POST /mail/send' indicate creation of an email message (write operation).

Documented attack patterns abuse exactly the kind of access send_mail gives an agent:

POLICY

How to control send_mail

PolicyLayer is an MCP gateway — it sits between your AI agents and Mcp Afip, and nothing reaches the server without passing your rules. This is the rule we recommend for send_mail:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "send_mail": {
      "limits": [
        {
          "counter": "send_mail_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

send_mail 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.

Create a free account and register Mcp Afip — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

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All 1300 Mcp Afip tools →

Write tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about send_mail

What does the send_mail tool do? +

Send an email via POST /mail/send. Supply at least one. It is categorised as a Write tool in the Mcp Afip MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on send_mail? +

Register the Mcp Afip MCP server in PolicyLayer and add a rule for send_mail: 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 Mcp Afip. Nothing to install.

What risk level is send_mail? +

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

Can I rate-limit send_mail? +

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

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

send_mail is provided by the Mcp Afip MCP server (codespar/mcp-dev-latam). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Mcp Afip tool call.

Start from Mcp Afip, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →