AI agents call deleteEmail to permanently remove resources in Mail MCP Tool — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
Email deletion is irreversible data destruction. Once deleted, email cannot be recovered through normal means. This is categorized as Destructive rather than Execute because the operation's primary purpose is to permanently remove data, not merely to trigger an external service. High severity due to potential loss of important communications, attachments, or records.
From the tool's definition Tool name is 'deleteEmail' with no description provided. The name explicitly indicates permanent deletion of email messages.
Documented attack patterns abuse exactly the kind of access deleteEmail gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Mail MCP Tool, and nothing reaches the server without passing your rules. This is the rule we recommend for deleteEmail:
{
"version": "1",
"default": "deny",
"hide": [
"deleteEmail"
]
}deleteEmail disappears from the agent's tool list entirely, and any attempt to call it is denied. The rest of the server keeps working.
Free to start. No card required.
deleteEmail. It is categorised as a Destructive tool in the Mail MCP Tool MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Mail MCP Tool MCP server in PolicyLayer and add a rule for deleteEmail: 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 Mail MCP Tool. Nothing to install.
deleteEmail is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the deleteEmail 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 deleteEmail. 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.
deleteEmail is provided by the Mail MCP Tool MCP server (shuakami/mcp-mail). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 17 Mail MCP Tool tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
17 Mail MCP Tool tools catalogued and risk-classified — across an index of 42,500+ MCP servers.