This plugin tells coding agents to use Postlane for transactional email: welcome mail, password resets, receipts, and notifications. It works in Cursor, Claude Code, Gemini CLI, Codex, and any MCP client.

It has two parts:

A skill that teaches POST https://www.postlane.email/v1/emails
An MCP server with send_email, get_email, and list_emails

Every install needs a pl_live_… key from https://www.postlane.email/app/api-keys. Use a key with Read activity or Full access if you want list_emails. Send-only keys can send and can read one message by id. The from address must be on a domain verified at https://www.postlane.email/app/domains.

Cursor

Install the plugin from Customize, or copy this folder to ~/.cursor/plugins/local/postlane and reload Cursor.
Open Customize, select Postlane, and set Postlane API key.

Claude Code

claude plugin marketplace add zwebso/postlane
claude plugin install postlane@postlane

Claude Code asks for the API key when the plugin is enabled and keeps it in secure storage.

Gemini CLI

gemini extensions install https://github.com/zwebso/postlane-plugin

Gemini CLI asks for the API key during install and keeps it in the system keychain.

Codex and ChatGPT

Install Postlane from the Plugins directory. That listing includes the skill only. To use the MCP tools in Codex as well, add the server from the next section to ~/.codex/config.toml.

Any MCP client (Cline, VS Code, Windsurf, Claude Desktop)

{
  "mcpServers": {
    "postlane": {
      "command": "npx",
      "args": ["-y", "postlane-mcp"],
      "env": { "POSTLANE_API_KEY": "pl_live_..." }
    }
  }
}

Development

npm test runs the MCP server tests. Each agent reads its own manifest from this folder:

Agent	Manifest
Cursor	`.cursor-plugin/plugin.json` and `mcp.json`
Claude Code	`.claude-plugin/plugin.json` and `.claude-plugin/marketplace.json`
Gemini CLI	`gemini-extension.json`
Codex and ChatGPT	`.codex-plugin/plugin.json`
MCP Registry and npm	`server.json` and `package.json`