Get sandbox inbox details including SMTP credentials, email counts, and status
AI agents call get-sandbox-inbox to retrieve information from Mcp Mailtrap without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves read-only information about a sandbox inbox (SMTP credentials, counts, status). While SMTP credentials are sensitive, the tool itself only reads and returns existing data without creating, modifying, or deleting anything. The blast radius of misuse is limited to information disclosure within the sandbox environment, not operational impact.
From the tool's definition Tool name is 'get-sandbox-inbox' and description states it 'Get sandbox inbox details including SMTP credentials, email counts, and status' — purely retrieval of configuration and status information with no modification or side effects.
Attacks that exploit this kind of access
Get sandbox inbox details including SMTP credentials, email counts, and status. It is categorised as a Read tool in the Mcp Mailtrap MCP Server, which means it retrieves data without modifying state.
Register the Mcp Mailtrap MCP server in PolicyLayer and add a rule for get-sandbox-inbox: 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 Mailtrap. Nothing to install.
get-sandbox-inbox 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 get-sandbox-inbox 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 get-sandbox-inbox. 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.
get-sandbox-inbox is provided by the Mcp Mailtrap MCP server (mcp-mailtrap). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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