List all attachments from a specific received (inbox) email. Returns attachment metadata including filename, size, content type, and a time-limited download URL. Use for emails listed by list-received-emails.
AI agents call list-received-email-attachments to retrieve information from Email Sending MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and queries email attachment metadata without creating, modifying, deleting, or executing any operations. It only returns information about attachments that already exist, making it a Read operation with low risk—the worst-case misuse would be unauthorized enumeration of attachment metadata from an accessible email account, not data destruction, code execution, or financial impact.
From the tool's definition Tool description states it 'List all attachments from a specific received (inbox) email' and 'Returns attachment metadata including filename, size, content type, and a time-limited download URL.' The verb 'List' and action of retrieving metadata with no…
Documented attack patterns abuse exactly the kind of access list-received-email-attachments gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Email Sending MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for list-received-email-attachments:
{
"version": "1",
"default": "deny",
"tools": {
"list-received-email-attachments": {}
}
}list-received-email-attachments is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List all attachments from a specific received (inbox) email. Returns attachment metadata including filename, size, content type, and a time-limited download URL. Use for emails listed by list-received-emails. It is categorised as a Read tool in the Email Sending MCP MCP Server, which means it retrieves data without modifying state.
Register the Email Sending MCP server in PolicyLayer and add a rule for list-received-email-attachments: 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 Email Sending MCP. Nothing to install.
list-received-email-attachments 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-received-email-attachments 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-received-email-attachments. 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-received-email-attachments is provided by the Email Sending MCP server (resend/resend-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 77 Email Sending MCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
77 Email Sending MCP tools catalogued and risk-classified — across an index of 42,500+ MCP servers.