delete_mail_rule

Delete a mail filter. This is irreversible. Requires TREKMAIL_ALLOW_DESTRUCTIVE=true.

SERVERTrekMail MCP Server SOURCEtrekmail/mcp-server

Critical RISK CLASS

Category Destructive

Parameters 00 required

Recommended Hiddensee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/trekmail-mcp-server/delete-mail-rule.md

WHAT IT DOES

What delete_mail_rule does on TrekMail MCP Server

AI agents call delete_mail_rule to permanently remove resources in TrekMail MCP Server, typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.

RISK

Why delete_mail_rule is rated Critical

The tool permanently removes a mail filter configuration without ability to undo the action. This is irreversible data loss, meeting the definition of Destructive category. The high severity reflects that deleting mail rules could disrupt email filtering for users or organizations, though the blast radius is somewhat contained compared to destructive operations affecting user data directly.

From the tool's definition Tool name contains 'delete'. Description explicitly states 'This is irreversible.' and requires a destructive operation flag (TREKMAIL_ALLOW_DESTRUCTIVE=true) to execute.

Attacks that exploit this kind of access

RECOMMENDED RULE

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

delete_mail_rule Hidden

delete_mail_rule is removed from the agent's tool list entirely, so the agent never calls it. The rest of the server keeps working.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "hide": [
    "delete_mail_rule"
  ]
}

RESTRICT 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 delete_mail_rule call is checked against it from then on.

FAQ

Questions about delete_mail_rule

What does the delete_mail_rule tool do? +

Delete a mail filter. This is irreversible. Requires TREKMAIL_ALLOW_DESTRUCTIVE=true. It is categorised as a Destructive tool in the TrekMail MCP Server MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.

How do I enforce a policy on delete_mail_rule? +

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

delete_mail_rule is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit delete_mail_rule? +

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

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

delete_mail_rule 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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