postmark_send_email · Integrations MCP: Risk & Policy

WHAT IT DOES

What postmark_send_email does on Integrations MCP

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

WHY IT NEEDS A POLICY

Why postmark_send_email needs a policy

Sending emails is a Write operation that creates/modifies data (new email records in the email service and recipient inboxes) with reversible consequences (emails can theoretically be recalled or deleted, though practical recourse is limited). It is not Destructive since emails are not permanently unrecoverable by design. It is not Financial, Execute, or Read.

From the tool's definition Tool name is 'postmark_send_email', which sends emails through the Postmark email service provider. The function is to create and transmit email messages.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

postmark_send_email Rate-limited

postmark_send_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": {
    "postmark_send_email": {
      "limits": [
        {
          "counter": "postmark_send_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 Integrations MCP, so you can run agents against it safely.

FAQ

Questions about postmark_send_email

What does the postmark_send_email tool do? +

postmark_send_email. It is categorised as a Write tool in the Integrations MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on postmark_send_email? +

Register the Integrations MCP server in PolicyLayer and add a rule for postmark_send_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 Integrations MCP. Nothing to install.

What risk level is postmark_send_email? +

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

Can I rate-limit postmark_send_email? +

Yes. Add a rate_limit block to the postmark_send_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 postmark_send_email completely? +

Set action: deny in the PolicyLayer policy for postmark_send_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 postmark_send_email? +

postmark_send_email is provided by the Integrations MCP server (shriram-vasudevan/integrations-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.