list_domain_bounces

List recent per-recipient hard/soft bounces for outbound mail sent from a domain. Each result includes the SMTP status code and the receiver

SERVERTrekMail MCP Server SOURCEtrekmail/mcp-server

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/trekmail-mcp-server/list-domain-bounces.md

WHAT IT DOES

What list_domain_bounces does on TrekMail MCP Server

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

RISK

Why list_domain_bounces is rated Low

This tool retrieves historical bounce metrics and SMTP status information for outbound mail, which is a read-only query operation. It has no capacity to modify, delete, or execute actions—it simply reports on delivery status. The blast radius of misuse is minimal; an agent could view bounce data but cannot harm email infrastructure or user data.

From the tool's definition Tool name 'list_domain_bounces' and description 'List recent per-recipient hard/soft bounces' indicate querying and retrieval of bounce data with no modification or side effects.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs list_domain_bounces 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 list_domain_bounces, this is the rule to start with:

list_domain_bounces Allowed

list_domain_bounces 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": {
    "list_domain_bounces": {}
  }
}

ALLOW ONLY 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 list_domain_bounces call is checked against it from then on.

FAQ

Questions about list_domain_bounces

What does the list_domain_bounces tool do? +

List recent per-recipient hard/soft bounces for outbound mail sent from a domain. Each result includes the SMTP status code and the receiver. It is categorised as a Read tool in the TrekMail MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list_domain_bounces? +

Register the TrekMail MCP Server MCP server in PolicyLayer and add a rule for list_domain_bounces: 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 list_domain_bounces? +

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

Can I rate-limit list_domain_bounces? +

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

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

list_domain_bounces 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.

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