
Mailer MCP
A Model Context Protocol (MCP) server for sending emails. This server is designed to be completely SMTP provider agnostic, allowing you to use any SMTP relay service of your choice (Gmail, SendGrid, Mailgun, SMTP2Go, etc.) by simply configuring the appropriate environment variables. The server provides tools for sending emails through SMTP using environment variables for configuration.
Features
- Send emails to specified recipients
- Test email functionality
- Environment variable configuration
- Proper error handling and logging
- TypeScript implementation for type safety
Installation
- Clone the repository:
git clone https://github.com/yourusername/mailer-mcp.git
cd mailer-mcp
- Install dependencies:
npm install
- Build the project:
npm run build
Configuration
The server requires the following environment variables to be set in the MCP configuration:
Variable | Description | Example |
---|---|---|
SMTP_HOST |
SMTP server hostname | smtp.example.com |
SMTP_PORT |
SMTP server port | 587 |
SMTP_USER |
SMTP username | user@example.com |
SMTP_PASSWORD |
SMTP password | password123 |
EMAIL_FROM |
Sender email address | sender@example.com |
Optional environment variables:
Variable | Description | Default |
---|---|---|
SMTP_SECURE |
Use secure connection (TLS) | false |
SMTP_REJECT_UNAUTHORIZED |
Reject unauthorized TLS certificates | true |
SMTP_TIMEOUT |
Connection timeout in milliseconds | 10000 |
MCP Configuration
Add the following to your Cline MCP settings configuration file:
"email-server": {
"autoApprove": [],
"disabled": false,
"timeout": 60,
"command": "node",
"args": [
"path/to/mailer-mcp/dist/index.js"
],
"env": {
"SMTP_HOST": "smtp.example.com",
"SMTP_PORT": "587",
"SMTP_USER": "user@example.com",
"SMTP_PASSWORD": "password123",
"EMAIL_FROM": "sender@example.com"
},
"transportType": "stdio"
}
Available Tools
send_email
Sends an email to a specified recipient.
Parameters:
-
recipient
(string, required): Email address of the recipient -
body
(string, required): Email body content
Example:
{
"recipient": "recipient@example.com",
"body": "Hello, this is a test email from the MCP server."
}
test_email
Sends a test email to verify the configuration.
Parameters: None
Development
- Start the TypeScript compiler in watch mode:
npm run dev
-
Make your changes to the source files in the
src
directory. -
The TypeScript compiler will automatically recompile the files when changes are detected.
License
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Reviews

user_9N0T5kAk
Mailer-MCP is an exceptional tool for managing email campaigns efficiently. Created by yahyamohmuedpro99, this open-source project available on GitHub helps streamline the process with its intuitive design and robust features. Highly recommend it for anyone looking to enhance their email marketing efforts!