List all emails in the inbox.
AI agents call list_inbox_emails to retrieve information from Fastmail 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 email metadata from the inbox without creating, modifying, or deleting any data. It is a straightforward list/query operation typical of Read category tools. Severity is low because exposure of inbox listings could reveal information but does not directly compromise account security or enable destructive actions.
From the tool's definition Tool description states 'List all emails in the inbox' — a retrieval operation with no modification. Server description confirms 'Enables reading and searching Fastmail inbox emails' and 'listing inbox emails'. No side effects or data alteration.
Attacks that exploit this kind of access
List all emails in the inbox. It is categorised as a Read tool in the Fastmail MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Fastmail MCP Server MCP server in PolicyLayer and add a rule for list_inbox_emails: 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 Fastmail MCP Server. Nothing to install.
list_inbox_emails 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_inbox_emails 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_inbox_emails. 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_inbox_emails is provided by the Fastmail MCP Server MCP server (jeffjjohnston/fastmail-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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