添加 coremail 用户 user_at_domain 的别名信息
AI agents call delSmtpAlias to permanently remove resources in MCP-YNU FastMCP Server — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
The 'del' prefix indicates deletion of an SMTP alias, which is an irreversible removal operation. Despite the description text appearing to describe an 'add' operation (likely a copy-paste error in the description), the tool name clearly indicates deletion. Removing an email alias can disrupt mail delivery for affected users and cannot be easily undone without knowing the previous configuration.
From the tool's definition Tool name 'delSmtpAlias' strongly implies deletion; sibling tools include 'addSmtpAlias' and 'getSmtpAlias', confirming this is the delete counterpart for SMTP alias management
Attacks that exploit this kind of access
添加 coremail 用户 user_at_domain 的别名信息. It is categorised as a Destructive tool in the MCP-YNU FastMCP Server MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the MCP-YNU FastMCP Server MCP server in PolicyLayer and add a rule for delSmtpAlias: 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-YNU FastMCP Server. Nothing to install.
delSmtpAlias is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the delSmtpAlias 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 delSmtpAlias. 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.
delSmtpAlias is provided by the MCP-YNU FastMCP Server MCP server (ynu/mcp-ynu). 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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