> ## Documentation Index
> Fetch the complete documentation index at: https://resend.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.
# Send emails with Flask
> Learn how to send your first email using Flask and the Resend Python SDK.
## Prerequisites
Before you start, you'll need:
* A Resend [API key](/create-an-api-key)
* A [verified domain](/add-a-domain)
## Guide
Get the Resend Python SDK.
```bash Pip theme={"theme":{"light":"github-light","dark":"vesper"}}
pip install resend
```
The easiest way to send an email is by using the `html` parameter.
```py index.py theme={"theme":{"light":"github-light","dark":"vesper"}}
import resend
import os
from flask import Flask, jsonify
resend.api_key = os.environ["RESEND_API_KEY"]
app = Flask(__name__)
@app.route("/")
def index():
params: resend.Emails.SendParams = {
"from": "Acme ",
"to": ["delivered@resend.dev"],
"subject": "hello world",
"html": "it works!",
}
r = resend.Emails.send(params)
return jsonify(r)
if __name__ == "__main__":
app.run()
```
## Examples
Full Flask web application
Basic email sending
Send emails with file attachments
Send emails using Resend hosted templates
Schedule emails for future delivery
Manage contacts and audiences
Create and manage sending domains
Receive and process inbound emails
Double opt-in subscription flow