Get MX (mail) records for a domain.
AI agents call get_mx_records to retrieve information from Dnsdumpster without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves MX records via DNS reconnaissance, which is a read-only operation. While DNS reconnaissance itself can be part of reconnaissance for potential attacks, the tool itself only retrieves publicly available DNS data without modifying systems or executing code.
From the tool's definition Tool description states 'Get MX (mail) records for a domain' - a retrieval operation with no modification or side effects. MX records are DNS records that route email for a domain. The action is querying/fetching data only.
Attacks that exploit this kind of access
Get MX (mail) records for a domain. It is categorised as a Read tool in the Dnsdumpster MCP Server, which means it retrieves data without modifying state.
Register the Dnsdumpster MCP server in PolicyLayer and add a rule for get_mx_records: 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 Dnsdumpster. Nothing to install.
get_mx_records 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_mx_records 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_mx_records. 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_mx_records is provided by the Dnsdumpster MCP server (maxweeden/mcp-dnsdumpster). 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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