List all mail filters for a mailbox. Filters automatically process incoming email — forward by sender/subject/content, sort into folders, flag, or discard. Pro and Agency plans only.
AI agents call list_mail_rules to retrieve information from TrekMail MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and displays configuration data about mail rules without creating, modifying, deleting, or executing any actions. It is purely informational, similar to 'get' or 'fetch' operations. Severity is low because reading mail rule metadata poses minimal risk even if accessed by an unauthorized agent—it exposes configuration details but cannot alter email flow or trigger destructive actions.
From the tool's definition Tool name 'list_mail_rules' and description 'List all mail filters for a mailbox' indicate a retrieval operation with no modification capability.
Attacks that exploit this kind of access
List all mail filters for a mailbox. Filters automatically process incoming email — forward by sender/subject/content, sort into folders, flag, or discard. Pro and Agency plans only. It is categorised as a Read tool in the TrekMail MCP Server MCP Server, which means it retrieves data without modifying state.
Register the TrekMail MCP Server MCP server in PolicyLayer and add a rule for list_mail_rules: 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.
list_mail_rules is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the list_mail_rules 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.
Set action: deny in the PolicyLayer policy for list_mail_rules. 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.
list_mail_rules 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.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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