What is Mailtrap?

Mailtrap is an MCP server integration that enables sending transactional emails through the Mailtrap API, acting as an email service provider for developers.

How to use Mailtrap?

1. Configure the MCP server with your Mailtrap API token and default sender email
2. Use commands to send emails with parameters like recipient, subject, content, and CC/BCC
3. Support for both plain text and HTML email formats

Key features of Mailtrap?

• Seamless integration with Mailtrap's transactional email API
• Support for HTML and plain text email content
• CC/BCC recipient handling and email categorization
• Flexible configuration via environment variables

Use cases of Mailtrap?

1. Sending automated confirmation emails (e.g., account registration)
2. Delivering application notifications and alerts
3. Managing marketing email campaigns with tracking categories

FAQ from Mailtrap?

• Does Mailtrap support HTML emails?

Yes, the tool supports both HTML and plain text email formats.

• Is Mailtrap free to use?

Mailtrap requires a Mailtrap API token - usage may depend on your Mailtrap account's pricing plan.

• How reliable is email delivery?

Delivery reliability depends on Mailtrap's API status and your email content compliance with deliverability standards.

MCP Mailtrap Server

An MCP server that provides a tool for sending transactional emails via Mailtrap

Quick Install

Setup

Claude Desktop or Cursor

Add the following configuration:

{
  "mcpServers": {
    "mailtrap": {
      "command": "npx",
      "args": ["-y", "mcp-mailtrap"],
      "env": {
        "MAILTRAP_API_TOKEN": "your_mailtrap_api_token",
        "DEFAULT_FROM_EMAIL": "[email protected]"
      }
    }
  }
}

If you are using asdf for managing Node.js you must use absolute path to executable (example for Mac)

{
  "mcpServers": {
    "mailtrap": {
      "command": "/Users//.asdf/shims/npx", "args": ["-y", "mcp-mailtrap"], "env": { "PATH": "/Users//.asdf/shims:/usr/bin:/bin", "ASDF_DIR": "/opt/homebrew/opt/asdf/libexec", "ASDF_DATA_DIR": "/Users//.asdf", "ASDF_NODEJS_VERSION": "20.6.1", "MAILTRAP_API_TOKEN": "your_mailtrap_api_token", "DEFAULT_FROM_EMAIL": "[email protected]" } } } } ``` #### Claude Desktop config file location **Mac**: `~/Library/Application Support/Claude/claude_desktop_config.json` **Windows**: `%APPDATA%\Claude\claude_desktop_config.json` #### Cursor config file location **Mac**: `~/.cursor/mcp.json` **Windows**: `%USERPROFILE%\.cursor\mcp.json` ### VS Code #### Manually changing config Run in Command Palette: `Preferences: Open User Settings (JSON)` Then, in the settings file, add the following configuration: ```json { "mcp": { "servers": { "mailtrap": { "command": "npx", "args": ["-y", "mcp-mailtrap"], "env": { "MAILTRAP_API_TOKEN": "your_mailtrap_api_token", "DEFAULT_FROM_EMAIL": "[email protected]" } } } } } ``` > [!TIP] > Don't forget to restart your MCP server after changing the "env" section. ## Usage Once configured, you can ask agent to send emails, for example: - "Send an email to [email protected] with the subject 'Meeting Tomorrow' and a friendly reminder about our upcoming meeting." - "Email [email protected] about the project update, and CC the team at [email protected]" ## Available Tools ### send-email Sends a transactional email through Mailtrap. **Parameters:** - `to` (required): Email address of the recipient - `subject` (required): Email subject line - `from` (optional): Email address of the sender, if not provided "DEFAULT_FROM_EMAIL" will be used - `text` (optional): Email body text, require if "html" is empty - `html` (optional): HTML version of the email body, required if "text" is empty - `cc` (optional): Array of CC recipient email addresses - `bcc` (optional): Array of BCC recipient email addresses - `category` (optional): Email category for tracking ## Development 1. Clone the repository: ```bash git clone https://github.com/railsware/mailtrap-mcp.git cd mailtrap-mcp ``` 2. Install dependencies: ```bash npm install ``` ### Configuration with Claude Desktop or Cursor > [!TIP] > See the location of the config file in the [Setup](#setup) section. Add the following configuration: ```json { "mcpServers": { "mailtrap": { "command": "node", "args": ["/path/to/mailtrap-mcp/dist/index.js"], "env": { "MAILTRAP_API_TOKEN": "your_mailtrap_api_token", "DEFAULT_FROM_EMAIL": "[email protected]" } } } } ``` If you are using `asdf` for managing Node.js you should use absolute path to executable: (example for Mac) ```json { "mcpServers": { "mailtrap": { "command": "/Users//.asdf/shims/node", "args": ["/path/to/mailtrap-mcp/dist/index.js"], "env": { "PATH": "/Users//.asdf/shims:/usr/bin:/bin", "ASDF_DIR": "/opt/homebrew/opt/asdf/libexec", "ASDF_DATA_DIR": "/Users//.asdf", "ASDF_NODEJS_VERSION": "20.6.1", "MAILTRAP_API_TOKEN": "your_mailtrap_api_token", "DEFAULT_FROM_EMAIL": "[email protected]" } } } } ``` ### VS Code > [!TIP] > See the location of the config file in the [Setup](#setup) section. ```json { "mcp": { "servers": { "mailtrap": { "command": "node", "args": ["/path/to/mailtrap-mcp/dist/index.js"], "env": { "MAILTRAP_API_TOKEN": "your_mailtrap_api_token", "DEFAULT_FROM_EMAIL": "[email protected]" } } } } } ``` ## Testing You can test the server using the [MCP Inspector](https://github.com/modelcontextprotocol/inspector): ```bash npm run dev ``` ## Contributing Bug reports and pull requests are welcome on [GitHub](https://github.com/railsware/mailtrap-mcp). This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the [code of conduct](CODE_OF_CONDUCT.md). ## License The package is available as open source under the terms of the [MIT License](https://opensource.org/licenses/MIT). ## Code of Conduct Everyone interacting in the Mailtrap project's codebases, issue trackers, chat rooms and mailing lists is expected to follow the [code of conduct](CODE_OF_CONDUCT.md).