email.validate

SERVERMcp SOURCE@2sio/mcp

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-github-2s-io-mcp/email.validate.md

WHAT IT DOES

What email.validate does on Mcp

AI agents call email.validate to retrieve information from Mcp without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why email.validate is rated Low

This is a validation and information-retrieval tool. It queries email syntax, performs DNS lookups for MX records, and returns classification flags—all read-only operations with no capability to modify, delete, execute code, or affect financial state. The explicit disclaimer that it provides 'signals only' and makes no guarantees confirms it is purely informational.

From the tool's definition Tool description explicitly states it 'Validate[s] an email address' and 'reports' on syntax, normalization, disposability flags, and MX records. It performs DNS queries (DNS-over-HTTPS for MX records) and analysis only.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs email.validate safely

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

email.validate Allowed

email.validate is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "email.validate": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

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

FAQ

Questions about email.validate

What does the email.validate tool do? +

Validate an email address: RFC syntax validity, normalized address with local/domain, and flags for isDisposable (throwaway domain), isRoleAccount (info@/support@/…), isFreeProvider (gmail/outlook/…). With checkMx (default true) also reports hasMxRecords (domain MX presence, via DNS-over-HTTPS) + MX hosts. NOT a deliverability or mailbox-existence guarantee — signals only. For signup hygiene and lead scrubbing. It is categorised as a Read tool in the Mcp MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on email.validate? +

Register the MCP server in PolicyLayer and add a rule for email.validate: 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. Nothing to install.

What risk level is email.validate? +

email.validate is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit email.validate? +

Yes. Add a rate_limit block to the email.validate 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 email.validate completely? +

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

email.validate is provided by the MCP server (@2sio/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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