Send a transactional email using a template.
AI agents use send_transactional_email to create or update resources in Listmonk MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Listmonk MCP Server environment.
This tool creates and transmits transactional emails, which constitutes a Write operation (creates data/side effects reversibly). It does not execute arbitrary code (Execute), delete data (Destructive), or move money (Financial).
From the tool's definition Tool name 'send_transactional_email' and description 'Send a transactional email using a template' indicates email dispatch—a data creation/transmission operation that modifies system state (sending outbound mail) but is reversible in nature (email can be…
Documented attack patterns abuse exactly the kind of access send_transactional_email gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Listmonk MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for send_transactional_email:
{
"version": "1",
"default": "deny",
"tools": {
"send_transactional_email": {
"limits": [
{
"counter": "send_transactional_email_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}send_transactional_email 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.
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Send a transactional email using a template. It is categorised as a Write tool in the Listmonk MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Listmonk MCP Server MCP server in PolicyLayer and add a rule for send_transactional_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 Listmonk MCP Server. Nothing to install.
send_transactional_email is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the send_transactional_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 send_transactional_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.
send_transactional_email is provided by the Listmonk MCP Server MCP server (rhnvrm/listmonk-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 29 Listmonk MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
29 Listmonk MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.