email_sender.py•2.36 kB
#!/usr/bin/env python3
# """
# MCP Server for Email Sending
# Allows AI assistants to send emails using Resend API
# """
import asyncio
import os
from typing import List
from dotenv import load_dotenv
import resend
# Load environment variables
load_dotenv()
# Initialize Resend with API key
resend.api_key = os.getenv("RESEND_API_KEY")
# Import FastMCP
try:
from mcp.server.fastmcp import FastMCP
except ImportError:
# Fallback for older MCP versions
from mcp.server import Server
from mcp.types import Tool, TextContent
# Initialize MCP server
mcp = FastMCP("Email Sender")
@mcp.tool()
async def send_email(
to: List[str],
subject: str,
body: str,
from_email: str = "onboarding@resend.dev",
plain_text: str | None = None,
) -> str:
"""
Send an email to one or more recipients.
Args:
to: List of recipient email addresses
subject: Email subject line
body: Email body content (HTML supported)
from_email: Sender email address (optional, defaults to onboarding@resend.dev)
Returns:
Success message with email ID or error message
"""
try:
# Validate inputs
if not to or not subject or not body:
return "Error: Missing required fields (to, subject, body)"
if not resend.api_key:
return "Error: RESEND_API_KEY not found in environment variables"
# Build a simple text fallback if not provided
text_fallback = plain_text if plain_text is not None else (
body.replace("<br>", "\n").replace("<br/>", "\n").replace("<br />", "\n").replace("</p>", "\n").replace("<p>", "")
)
# If only one recipient, pass a string like test_email does
to_field = to[0] if isinstance(to, list) and len(to) == 1 else to
# Send email using Resend (mirror test_email structure)
response = resend.Emails.send({
"from": from_email,
"to": to_field,
"subject": subject,
"html": body,
"text": text_fallback,
})
return f"Email sent successfully! id={response.get('id', 'Unknown')} to={to_field} subject={subject}"
except Exception as e:
return f"Error sending email: {str(e)}"
if __name__ == "__main__":
# Run the MCP server
mcp.run()