reply_all_email

Reply to all recipients of an email.

SERVERMicrosoft MCP SOURCE0xka13b/microsoft-mcps

Medium RISK CLASS

Category Write

Parameters 32 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/0xka13b-microsoft-mcps/reply-all-email.md

WHAT IT DOES

What reply_all_email does on Microsoft MCP

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

Parameter	Type	Required	Description
`body`	string	Yes	Reply body
`email_id`	string	Yes	Message ID to reply-all to
`body_type`	string	—	Body content type. Defaults to text.

Parameters from the server's own tool schema.

RISK

Why reply_all_email is rated Medium

This tool sends an email reply to all recipients of an existing email. It creates new outbound messages, which is a Write operation. The severity is high because an AI agent could accidentally or maliciously send replies to a large group of recipients, potentially leaking sensitive information or causing reputational/organizational harm at scale ('reply all' storms, unintended disclosure).

From the tool's definition Reply to all recipients of an email

Risk signalsAccepts raw HTML/template content (body)

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs reply_all_email safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Microsoft MCP, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For reply_all_email, this is the rule to start with:

reply_all_email Rate-limited

reply_all_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": {
    "reply_all_email": {
      "limits": [
        {
          "counter": "reply_all_email_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Microsoft MCP, apply this rule, and every reply_all_email call is checked against it from then on.

FAQ

Questions about reply_all_email

What does the reply_all_email tool do? +

Reply to all recipients of an email. It is categorised as a Write tool in the Microsoft MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

What parameters does reply_all_email accept? +

reply_all_email accepts 3 parameters: body, email_id, body_type. Required: body, email_id. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on reply_all_email? +

Register the Microsoft MCP server in PolicyLayer and add a rule for reply_all_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 Microsoft MCP. Nothing to install.

What risk level is reply_all_email? +

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

Can I rate-limit reply_all_email? +

Yes. Add a rate_limit block to the reply_all_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 reply_all_email completely? +

Set action: deny in the PolicyLayer policy for reply_all_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 reply_all_email? +

reply_all_email is provided by the Microsoft MCP server (0xka13b/microsoft-mcps). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

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