Search messages sent to a specific recipient email address with optional date range. Auto-connects if not already connected.
AI agents call search_by_recipient to retrieve information from Mcp Mail Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool searches and retrieves email messages based on recipient filtering, which is a read-only operation with no side effects. The optional date range parameter further indicates it is purely for querying/filtering existing data. The auto-connect behavior is transparent setup, not an action affecting data state.
From the tool's definition Tool description states 'Search messages sent to a specific recipient email address' — a query operation that retrieves data without modification. No delete, modify, execute, or financial operations are described.
Attacks that exploit this kind of access
Search messages sent to a specific recipient email address with optional date range. Auto-connects if not already connected. It is categorised as a Read tool in the Mcp Mail Server MCP Server, which means it retrieves data without modifying state.
Register the Mcp Mail Server MCP server in PolicyLayer and add a rule for search_by_recipient: 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 Mcp Mail Server. Nothing to install.
search_by_recipient 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 search_by_recipient 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 search_by_recipient. 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.
search_by_recipient is provided by the Mcp Mail Server MCP server (mcp-mail-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
search_by_recipient is one line of Mcp Mail Server's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
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