send_email_with_custom_config · Email Sender MCP Server MCP

WHAT IT DOES

What send_email_with_custom_config does on Email Sender MCP Server

AI agents use send_email_with_custom_config to create or update resources in Email Sender MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Email Sender MCP Server environment.

WHY IT NEEDS A POLICY

Why send_email_with_custom_config needs a policy

This tool sends emails, which modifies external state (recipient inboxes receive new messages). It does not read, execute arbitrary code, delete data, or move money. However, the severity is high rather than medium because unsupervised email sending could be abused for spam, phishing, impersonation, or business email compromise attacks, especially with custom SMTP configuration allowing flexibility in sender…

From the tool's definition Tool name is 'send_email_with_custom_config' and sibling tool 'send_email' is described as 'Enables sending emails through SMTP with support for multiple recipients, attachments, CC/BCC, and both plain text and HTML formats.' This tool creates outbound email…

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

send_email_with_custom_config Rate-limited

send_email_with_custom_config stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "send_email_with_custom_config": {
      "limits": [
        {
          "counter": "send_email_with_custom_config_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Email Sender MCP Server, so you can run agents against it safely.

FAQ

Questions about send_email_with_custom_config

What does the send_email_with_custom_config tool do? +

send_email_with_custom_config. It is categorised as a Write tool in the Email Sender MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on send_email_with_custom_config? +

Register the Email Sender MCP Server MCP server in PolicyLayer and add a rule for send_email_with_custom_config: 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 Email Sender MCP Server. Nothing to install.

What risk level is send_email_with_custom_config? +

send_email_with_custom_config is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit send_email_with_custom_config? +

Yes. Add a rate_limit block to the send_email_with_custom_config 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.

How do I block send_email_with_custom_config completely? +

Set action: deny in the PolicyLayer policy for send_email_with_custom_config. 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.

What MCP server provides send_email_with_custom_config? +

send_email_with_custom_config is provided by the Email Sender MCP Server MCP server (wyccywwyc/emailmcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.