Download a message as an EML file. Returns base64 content.
AI agents call mailosaur_files_get_email to retrieve information from Mailosaur MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool retrieves and downloads existing email message data in EML format. While it accesses message content, it performs no side effects, modifications, deletions, or external operations. This is a straightforward read operation typical of email testing services. The blast radius is limited: exposure would allow an AI to retrieve test email messages but not modify, delete, or trigger external actions.
From the tool's definition Tool name contains 'get' and description states 'Download a message as an EML file. Returns base64 content.' — retrieval and download operations with no modification or deletion of data.
Attacks that exploit this kind of access
Download a message as an EML file. Returns base64 content. It is categorised as a Read tool in the Mailosaur MCP MCP Server, which means it retrieves data without modifying state.
Register the Mailosaur MCP server in PolicyLayer and add a rule for mailosaur_files_get_email: 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 Mailosaur MCP. Nothing to install.
mailosaur_files_get_email 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 mailosaur_files_get_email 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 mailosaur_files_get_email. 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.
mailosaur_files_get_email is provided by the Mailosaur MCP server (mrnewdelhi/mailosaur-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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