A Claude Code plugin that connects to a Mailpit test mailbox, where application emails can be safely captured and inspected.

Use it to configure the Mailpit MCP endpoint and optional bearer token, then access Mailpit's email-testing tools.

It gives the coding agent a configured connection for checking test emails without sending messages to real recipients.

mailpit — Plugin by CeDJeY

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Claude Code

/plugin marketplace add CeDJeY/mailpit-mcp-server

agentmods

npx agentmods add plugins/cedjey/mailpit-mcp-server/plugin

Clone the repo

git clone --depth 1 https://github.com/CeDJeY/mailpit-mcp-server

Made for: Claude Code.

Per session not measured What this adds to a session before it is invoked.

When invoked not measured Not applicable: nothing here is loaded into a session.

Security scan A 0 findings. Scan, not verified.

Origin original No closer match found in the catalogue.

Security

Grade A, and why

mailpit scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

plugin/.claude-plugin/plugin.json · 29 lines

What it actually says

{
  "name": "mailpit",
  "displayName": "Mailpit Email Testing",
  "description": "Work with a Mailpit test mailbox: 15 MCP tools (read, search, send, wait-for, link/HTML checks) plus skills for email verification and SMTP routing setup",
  "version": "2.1.1",
  "author": {
    "name": "CeDJeY",
    "url": "https://github.com/CeDJeY"
  },
  "homepage": "https://github.com/CeDJeY/mailpit-mcp-server",
  "license": "MIT",
  "mcpServers": "./.mcp.json",
  "userConfig": {
    "mcp_url": {
      "type": "string",
      "title": "Mailpit MCP endpoint URL",
      "description": "The /mcp endpoint of your mailpit-mcp-server instance, e.g. https://mailpit-mcp.example.com/mcp",
      "default": ""
    },
    "auth_token": {
      "type": "string",
      "title": "Bearer token",
      "description": "The MCP_AUTH_TOKEN configured on the server; leave empty if the server runs without auth",
      "sensitive": true,
      "default": ""
    }
  }
}

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

yesterday First seen · 29 lines scan A ac5c9bebd4cd

Subscribe to this mod's changes

mailpit is a plugin published in the GitHub repository CeDJeY/mailpit-mcp-server (0 stars, last pushed 1mo ago), licensed MIT. Its token cost is not measured: this kind of file is read by the harness, not the model. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Productivity Research Testing

mailpit

Getting it into your agent

Grade A, and why

Nothing flagged

What it actually says

What this file has done since we first saw it

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