Send Email with FastAPI

Installation

Install the official Python SDK:

pip install reloop-email

Setup Environment Variables

Add your API key to your environment:

export RELOOP_API_KEY="re_your_api_key_here"

Sending an Email

Here is a simple FastAPI route that sends an email:

import os
from fastapi import FastAPI, HTTPException
from reloop_email import Reloop

app = FastAPI()
reloop = Reloop(api_key=os.environ.get("RELOOP_API_KEY"))

@app.post("/send-email")
async def send_email():
    try:
        result = reloop.mail.send({
            "from": "onboarding@reloop.sh",
            "to": "delivered@resend.dev",
            "subject": "Hello from FastAPI",
            "html": "<p>Congrats on sending your first email via Reloop from FastAPI!</p>",
        })
        if result.email_error:
            raise result.email_error
        return result.response
    except Exception as e:
        raise HTTPException(status_code=500, detail=str(e))