create_alias

SERVERTrekMail MCP Server SOURCEtrekmail/mcp-server

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/trekmail-mcp-server/create-alias.md

WHAT IT DOES

What create_alias does on TrekMail MCP Server

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

RISK

Why create_alias is rated Medium

This tool creates a new email alias, which is a reversible modification to email infrastructure. It does not execute arbitrary code, delete data, move money, or retrieve sensitive information. The severity is medium because creating unauthorized aliases could enable email spoofing or unauthorized sending, but the impact is limited to alias configuration and can be undone.

From the tool's definition Tool description states 'Add a new email alias to a mailbox' and 'Optionally allow sending from this alias address', indicating creation of new email configuration that modifies mailbox settings.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs create_alias safely

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

create_alias Rate-limited

create_alias 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": {
    "create_alias": {
      "limits": [
        {
          "counter": "create_alias_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 TrekMail MCP Server, apply this rule, and every create_alias call is checked against it from then on.

FAQ

Questions about create_alias

What does the create_alias tool do? +

Add a new email alias to a mailbox. The alias delivers mail into the same mailbox — no separate login needed. Optionally allow sending from this alias address. Requires Starter plan or above. Use list_domains to find domain IDs. It is categorised as a Write tool in the TrekMail MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on create_alias? +

Register the TrekMail MCP Server MCP server in PolicyLayer and add a rule for create_alias: 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 TrekMail MCP Server. Nothing to install.

What risk level is create_alias? +

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

Can I rate-limit create_alias? +

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

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

create_alias is provided by the TrekMail MCP Server MCP server (trekmail/mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

More on TrekMail MCP Server, and thousands of servers like it.

This server

All 248 TrekMail MCP Server tools →

Across the catalogue

create_task on 0rca Dojo MCP Server →create-task on Kanban MCP Server →create_package_backup on Android Forensics ADB MCP Server →create_project on Stitch MCP Server → The MCP Attack Database →

Guides

Govern customer-ops agents →Argument validation →Scoped token →